* Branch point for 2020 May 30 Breaking Change

* Migrate `ACTION_LAYER_TOGGLE` to `TG()` (#8954)

* Migrate `ACTION_MODS_ONESHOT` to `OSM()` (#8957)

* Migrate `ACTION_DEFAULT_LAYER_SET` to `DF()` (#8958)

* Migrate `ACTION_LAYER_MODS` to `LM()` (#8959)

* Migrate `ACTION_MODS_TAP_KEY` to `MT()` (#8968)

* Convert V-USB usbdrv to a submodule (#8321)

* Unify Tap Hold functions and documentation (#8348)

* Changing board names to prevent confusion (#8412)

* Move the Keyboardio Model01 to a keyboardio/ subdir (#8499)

* Move spaceman keyboards (#8830)

* Migrate miscellaneous `fn_actions` entries (#8977)

* Migrate `ACTION_MODS_KEY` to chained mod keycodes (#8979)

* Organizing my keyboards (plaid, tartan, ergoinu) (#8537)

* Refactor Lily58 to use split_common (#6260)

* Refactor zinc to use split_common (#7114)

* Add a message if bin/qmk doesn't work (#9000)

* Fix conflicting types for 'tfp_printf' (#8269)

* Fixed RGB_DISABLE_AFTER_TIMEOUT to be seconds based & small internals cleanup (#6480)

* Refactor and updates to TKC1800 code (#8472)

* Switch to qmk forks for everything (#9019)

* audio refactor: replace deprecated PLAY_NOTE_ARRAY (#8484)

* Audio enable corrections (2/3) (#8903)

* Split HHKB to ANSI and JP layouts and Add VIA support for each (#8582)

* Audio enable corrections (Part 4) (#8974)

* Fix typo from PR7114 (#9171)

* Augment future branch Changelogs (#8978)

* Revert "Branch point for 2020 May 30 Breaking Change"

* Add additional query functions for RGBLIGHT

* Add additional query functions for RGB Matrix

* Change names of enable check functions

* Fix macro for rgb matrix takeover of rgblight functions

* Add documentation for rgb_matrix_get_hsv()

* Add *_get_hsv function to rgblight

This commits add the SH_OS keycode, which works similarly to one shot
layers:
* while pressed, the keyboard is swapped
* if no keys were pressed while it was pressed, the next key press is
swapped

SH_OS also supports chaining with one shot layers:
OSL(x) + SH_OS + key interprets the key press on the oneshot layer.

The ONESHOT_TIMEOUT setting used by one shot keys and layers is also
used by oneshot swap hands. In the above chaining scenario the timeout
of the oneshot layer is reset when swap hands is activated.

Resolves #2682

* Allow 16 lighting layers

* Require #define RGBLIGHT_LAYERS_16 to enable 16 layers

* Override RGBLIGHT_MAX_LAYERS to set maximum number of lighting layers

* Enforce lower bound on RGBLIGHT_MAX_LAYERS

Co-Authored-By: Takeshi ISHII <2170248+mtei@users.noreply.github.com>

* Fix an error in the check for valid RGBLIGHT_MAX_LAYERS

* Don't use bitfield / PACKED, as it causes bloat

* Update documentation re: up to 32 lighting layers

* Run cformat

* Add note about increasing FW size in docs/config_options.md

Co-authored-by: Drashna Jaelre <drashna@live.com>

* Remove no-longer-valid comment

* Add doc note that split sync will be slower

Co-authored-by: Takeshi ISHII <2170248+mtei@users.noreply.github.com>
Co-authored-by: Drashna Jaelre <drashna@live.com>

* Add twinkle RGB Lighting effect

* 2nd twinkle algo - double-buffering

* Further refinement: Per-LED twinkle

* Add documentation for Twinkle RBG Lighting mode

* Bias twinkle saturation closer to the set value

* Fix whitespace

* Implement momentarily blink of lighting layers

* Refactor spidey3 userspace to use rgb layer blink

* Remove un-necessary line from example in documentation

* Revert "Refactor spidey3 userspace to use rgb layer blink"

This reverts commit 831649bb68.

* Adds a missing bit of documentation about lighting layer blink

* Update docs/feature_rgblight.md per suggestions

Co-authored-by: James Young <18669334+noroadsleft@users.noreply.github.com>

* Update docs/feature_rgblight.md per suggestions

Co-authored-by: James Young <18669334+noroadsleft@users.noreply.github.com>

* Update docs/feature_rgblight.md per suggestions

Co-authored-by: James Young <18669334+noroadsleft@users.noreply.github.com>

* cformat, as suggested

Co-authored-by: James Young <18669334+noroadsleft@users.noreply.github.com>

* Invert UC_MOD/UC_RMOD direction when Shift is held

Also use MOD_MASK_SHIFT in process_rgb.c

* Allow audio to be played for UC_MOD, UC_RMOD keycodes as well

* Fix signedness bug in reverse input mode cycling

* Misc formatting in process_unicode_common.c

* Address clang-format issues

* Make decode_utf8 helper function file-local (static)

* Branch point for 2020 May 30 Breaking Change

* audio-configuration: template: audio_avr.c does NOT default to C6

not on its own, it needs a pin configured per define in config.h for audio to actually work
otherwise only parts of the code are included in the firmware, wasting space and possibly breaking builds because auf hitting the firmware-size limits

* audio-configuration: strip comment to bare essentials

Co-Authored-By: Ryan <fauxpark@gmail.com>

* revert future change

Co-authored-by: James Young <18669334+noroadsleft@users.noreply.github.com>
Co-authored-by: Johannes <you@example.com>
Co-authored-by: Ryan <fauxpark@gmail.com>
Co-authored-by: zvecr <git@zvecr.com>

* add 'togglePin' conveniance function

for AVR and chibios

* drop outmost parantheses

Co-Authored-By: Konstantin Đorđević <vomindoraan@gmail.com>

* toggle pin on avrs

toggle a pin configured as output by writing the corresponding bit to the PIN register

Co-Authored-By: Takeshi ISHII <2170248+mtei@users.noreply.github.com>

* togglepin: add documentation for newly added function

* Update docs/internals_gpio_control.md

Co-Authored-By: Konstantin Đorđević <vomindoraan@gmail.com>

* on AVR: use PORTD to toggle the output

... since not all MCUs support toggling through writing to PIN

Co-Authored-By: Ryan <fauxpark@gmail.com>

Co-authored-by: Johannes <you@example.com>
Co-authored-by: Konstantin Đorđević <vomindoraan@gmail.com>
Co-authored-by: Takeshi ISHII <2170248+mtei@users.noreply.github.com>
Co-authored-by: Ryan <fauxpark@gmail.com>

* Added dvorak's spanish variant.

* Fixed spacing

* Fixed filename typo

* Applied fixes and suggestions.

* Fixed spacing

* Added sendstring_spanish_dvorak.h

* Fixed sendstring_spanish.h

* Update quantum/keymap_extras/sendstring_spanish_dvorak.h

Co-Authored-By: Ryan <fauxpark@gmail.com>

* Update quantum/keymap_extras/sendstring_spanish.h

Co-Authored-By: Ryan <fauxpark@gmail.com>

* Update quantum/keymap_extras/sendstring_spanish_dvorak.h

Co-Authored-By: Ryan <fauxpark@gmail.com>

Co-authored-by: joseandres42 <joseandres42@Orion-PC.localdomain>
Co-authored-by: Ryan <fauxpark@gmail.com>

* dipsw test on helix/rev2/sc/back:five_rows

* bug fix quantum/dip_switch.c

* test end. remove test code. Revert "dipsw test on helix/rev2/sc/back:five_rows"

This reverts commit 4b13ebb996.

* dipsw test on helix/rev2/sc/back:five_rows

* update quantum/dip_switch.c

* test end. remove test code. Revert "dipsw test on helix/rev2/sc/back:five_rows"

This reverts commit bf99ace095.

* Added Workman ZXCVM variation

* Update quantum/keymap_extras/keymap_workman_zxcvm.h

Co-Authored-By: Konstantin Đorđević <vomindoraan@gmail.com>

* Update quantum/keymap_extras/sendstring_workman_zxcvm.h

Co-Authored-By: Ryan <fauxpark@gmail.com>

* Update quantum/keymap_extras/keymap_workman_zxcvm.h

Co-Authored-By: Ryan <fauxpark@gmail.com>

* Update quantum/keymap_extras/keymap_workman_zxcvm.h

Co-Authored-By: Ryan <fauxpark@gmail.com>

* Update quantum/keymap_extras/sendstring_workman_zxcvm.h

Co-Authored-By: Ryan <fauxpark@gmail.com>

Co-authored-by: Konstantin Đorđević <vomindoraan@gmail.com>
Co-authored-by: Ryan <fauxpark@gmail.com>

* Fix bug with layer caching in get_event_keycode

* Improve naming

* quantum/debounce: Added sym_pk debounce algorithm

* Apply suggestions from code review

Co-Authored-By: Ryan <fauxpark@gmail.com>

* quantum/debounce/sym_pk: delete comments and rename functions following code review

* quantum/debounce/sym_pk: Modifications for code readability according to code review

* quantum/debounce/sym_pk: Modifications for code readability according to code review (2)

* quantum/debounce/sym_pk: code review: cleaner code

Co-Authored-By: Nick Brassel <nick@tzarc.org>

Co-authored-by: Ryan <fauxpark@gmail.com>
Co-authored-by: Nick Brassel <nick@tzarc.org>

* tmk_core/common: Fixing TIMER_DIFF macro to calculate difference correctly after the timer wraps.

Let's go through an example, using the following macro:

If the first timer read is 0xe4 and the second one is 0x32, the timer wrapped.
If the timer would have had more bits, it's new value would have been 0x132,
and the correct difference in time is 0x132 - 0xe4 = 0x4e

old code TIMER_DIFF_8(0x32, 0xe4) = 0xff - 0xe4 + 0x32 = 0x4d, which is wrong.
new code TIMER_DIFF_8(0x32, 0xe4) = 0xff + 1 - 0xe4 + 0x32 = 0x4e, which is correct.

This also gives a chance for a smart compiler to optimize the code using normal
integer overflow.

For example on AVR, the following C code:
uint8_t __attribute__ ((noinline)) test(uint8_t current_timer, uint8_t start_timer)
{
    return TIMER_DIFF_8(current_timer, start_timer);
}
With the original code, it gets translated to the following list of instructions:
00004c6e <test>:
    4c6e:       98 2f           mov     r25, r24
    4c70:       86 1b           sub     r24, r22
    4c72:       96 17           cp      r25, r22
    4c74:       08 f4           brcc    .+2             ; 0x4c78 <test+0xa>
    4c76:       81 50           subi    r24, 0x01       ; 1
    4c78:       08 95           ret
But with this commit, it gets translated to a single instruction:
00004c40 <test>:
    4c40:       86 1b           sub     r24, r22
    4c42:       08 95           ret

This unfortunately doesn't always work so nicely, for example the following C code:
int __attribute__ ((noinline)) test(uint8_t current_timer, uint8_t start_timer)
{
    return TIMER_DIFF_8(current_timer, start_timer);
}
(Note: return type changed to int)
With the original code it gets translated to:
00004c6e <test>:
    4c6e:       28 2f           mov     r18, r24
    4c70:       30 e0           ldi     r19, 0x00       ; 0
    4c72:       46 2f           mov     r20, r22
    4c74:       50 e0           ldi     r21, 0x00       ; 0
    4c76:       86 17           cp      r24, r22
    4c78:       20 f0           brcs    .+8             ; 0x4c82 <test+0x14>
    4c7a:       c9 01           movw    r24, r18
    4c7c:       84 1b           sub     r24, r20
    4c7e:       95 0b           sbc     r25, r21
    4c80:       08 95           ret
    4c82:       c9 01           movw    r24, r18
    4c84:       84 1b           sub     r24, r20
    4c86:       95 0b           sbc     r25, r21
    4c88:       81 50           subi    r24, 0x01       ; 1
    4c8a:       9f 4f           sbci    r25, 0xFF       ; 255
    4c8c:       08 95           ret
Wth this commit it gets translated to:
00004c40 <test>:
    4c40:       28 2f           mov     r18, r24
    4c42:       30 e0           ldi     r19, 0x00       ; 0
    4c44:       46 2f           mov     r20, r22
    4c46:       50 e0           ldi     r21, 0x00       ; 0
    4c48:       86 17           cp      r24, r22
    4c4a:       20 f0           brcs    .+8             ; 0x4c54 <test+0x14>
    4c4c:       c9 01           movw    r24, r18
    4c4e:       84 1b           sub     r24, r20
    4c50:       95 0b           sbc     r25, r21
    4c52:       08 95           ret
    4c54:       c9 01           movw    r24, r18
    4c56:       84 1b           sub     r24, r20
    4c58:       95 0b           sbc     r25, r21
    4c5a:       93 95           inc     r25
    4c5c:       08 95           ret
There is not much performance improvement in this case, however at least with this
commit it functions correctly.

Note: The following commit will improve compiler output for the latter example.

* tmk_core/common: Improve code generation for TIMER_DIFF* macros

Because of integer promotion the compiler is having a hard time generating
efficient code to calculate TIMER_DIFF* macros in some situations.
In the below example, the return value is "int", and this is causing the
trouble.

Example C code:

int __attribute__ ((noinline)) test(uint8_t current_timer, uint8_t start_timer)
{
    return TIMER_DIFF_8(current_timer, start_timer);
}

BEFORE: (with -Os)

00004c40 <test>:
    4c40:       28 2f           mov     r18, r24
    4c42:       30 e0           ldi     r19, 0x00       ; 0
    4c44:       46 2f           mov     r20, r22
    4c46:       50 e0           ldi     r21, 0x00       ; 0
    4c48:       86 17           cp      r24, r22
    4c4a:       20 f0           brcs    .+8             ; 0x4c54 <test+0x14>
    4c4c:       c9 01           movw    r24, r18
    4c4e:       84 1b           sub     r24, r20
    4c50:       95 0b           sbc     r25, r21
    4c52:       08 95           ret
    4c54:       c9 01           movw    r24, r18
    4c56:       84 1b           sub     r24, r20
    4c58:       95 0b           sbc     r25, r21
    4c5a:       93 95           inc     r25
    4c5c:       08 95           ret

AFTER: (with -Os)

00004c40 <test>:
    4c40:       86 1b           sub     r24, r22
    4c42:       90 e0           ldi     r25, 0x00       ; 0
    4c44:       08 95           ret

Note: the example is showing -Os but improvements can be seen at all optimization levels,
including -O0. We never use -O0, but I tested it to make sure that no extra code is
generated in that case.OA

* quantum/debounce: Fix custom wrapping timers in eager_pr and eager_pk debounce algorithms

Please see the below simulated sequence of events:
Column A is the 16-bit value returned by read_timer();
Column B is the value returned by custom_wrap_timer_read();
Column C is the original code: (timer_read() % MAX_DEBOUNCE)

    A,     B,     C
65530,    19,    30
65531,    20,    31
65532,    21,    32
65533,    22,    33
65534,    23,    34
65535,    24,    35
    0     25,     0
    1,    26,     1
    2,    27,     2
    3,    28,     3
    4,    29,     4
    5,    30,     5

read_timer() wraps about every 1.09 seconds, and so debouncing might
fail at these times without this commit.

* quantum/debounce/eager_pr and eager_pk: modifications for code readability according to code review.

* quantum/debounce/eager_pr and eager_pk: modifications for code readability according to code review. (2)

* Define NO_ACTION_MACRO/FUNCTION in header instead of makefile when LTO is enabled

Currently, boards and keymaps that define NO_ACTION_MACRO/FUNCTION unconditionally
will not compile with LTO_ENABLE (#8604). This fixes the issue by moving the
definitions from common.mk to action.h, which enables us to check for previous
definitions of those macros (this cannot be done in a makefile).

* Remove LTO checks in templates

Since now NO_ACTION_MACRO/FUNCTION are defined as needed in action.h (which is
included by quantum.h), checking for LTO in keyboard and user code is no
longer required.

* Update LTO_ENABLE docs

* Add Greek keymap

* Split left shift (unused), change keycode for dialytika tonos

* Update quantum/keymap_extras/keymap_greek.h

Co-Authored-By: Konstantin Đorđević <vomindoraan@gmail.com>

* Fix definition for DTON

Co-authored-by: Konstantin Đorđević <vomindoraan@gmail.com>

* Add Polish keymap

* Fix wrong AltGr mapping

* These are ogoneks, not cedillas

* Too many !s

* ANSI

* Just use BSLS

* Move BSLS

* Move PIPE

* Fix some incorrect names in keymap_slovak.h

Thanks to vomindoraan

* Add Korean keymap

* Switch to ANSI layout

* Update quantum/keymap_extras/keymap_korean.h

Co-Authored-By: Konstantin Đorđević <vomindoraan@gmail.com>

Co-authored-by: Konstantin Đorđević <vomindoraan@gmail.com>

* Initial support for ATtiny85

* Update mcu selection