* emon: configure ratios without reboot

* settings: serialize() support

* debug: use vsnprintf from newlib, not from sdk

* settings/experimental: show defaults via `get`

* emon: override base methods, fix defaults

* sensor/emon: expose internal index calculation

- refactor configuration to use the correct index when accessing indexed
  sensor methods. store index value on magnitude, refactor loops to
  accomodate this new functionality
- rename slot(index) -> description(index), since we use 'slot' as
  numeric value

- general conversion from .ino modules into a separate .cpp files
- clean-up internal headers, place libraries into .h. guard .cpp with _SUPPORT flags 
- fix some instances of shared variables instead of public methods
- tweak build system to still build a single source file via os environment variable ESPURNA_BUILD_SINGLE_SOURCE

- continue #2140 , use the correct implementation for http requests not confuse code readers with our parsing
- fix data sender data duplication, run build test
- add note that this is actually really RAM heavy, some connection failures are not easily distinguishable from any code errors and are simply OOM.

also
- fix arduinoota prototype error when building without it (... ino2cpp, again)
- add comment about 160mhz into the platformio.ini

* Thingspeak: cleanup

* fix sync client config, refactoring

* revert changes in tspk config

* inheritance

* fix empty wificlient

* Permit thingspeak urn edit

* Update thinkspeak.ino

* Update index.html

* Replace Host, Port, and URL with Address in Thingspeak

* Create AsyncThingspeak object

Create AsyncThingspeak object to contain the url of the component.

* replace pointer by class member

Thingspeak class improvement to answer Max's question:
why use a pointer when it can be a class member?
So now address parameter isn't a pointer anymore.

* Update Thingspeak address on post

* experimental: refactor get/set/del/hasSetting

* sensors

* lights

* cleaup

* r

* tuya

* fixup! sensors

* fixup! tuya

* header defaults types

* fix lights

* setup already checks for max

* helper for flashstring

* fix overload

* oops

* refactor includes

* warnings

* test with migrate

* add ids in a separate file

* cleanup

rev: crash

rev: domoticz

rev: encoder

rev: loopdelay

rev: hass

rev: i2c

rev2: hass

rev: mqtt

rev: rfm69

rev: relay

rev: rpn

rev: settings setup

rev: hb settings

rev: telnet preprocessor fix

rev: settings wrap

rev: tspk bool style

rev: wifi types

rev: util hb

rev: settings

fixup! rev: settings

* rev: cleanup wifi injections based on new getters

* hasSetting now can return true for empty key

* show hardcoded network in web

* oops

* fix ws referencing wrong index

* ensure empty strings are written

* c/p

* use experimental schema style for payload, mark network as not deletable

* allow to customize converter

* shorter syntax, try using with wifi

* use proper #if syntax to handle definitions that are missing

* fixup ota sc checks getter, cast schEnabled to bool

* add utils header to sensors

* web: revert changed from secure_client patch

* ota/httpupdate: use SecureClient

* ota/httpupdate: use scheduled function on mqtt event

* config: finish up 590282e changes + add warnings

* typo fix

* use bind instead of c++14 magic, use debug text from secureclient

* bump

* actually use the locking

- add experimental `relayDummy` to configure dummy relays at runtime
- add tuya-generic-dimmer #1729
- cleanup broker interface to allow Tuya module to properly receive events, modify broker methods to allow different function signatures
- add basic tests for Tuya frame and data protocol

* scheduler: match webui defaults

* relay: inverse error condition

* api: simplify apikey handling

* thingspeak: use apikey default value

* web: fix checkbox value for haschanged

* fixup! scheduler: match webui defaults

* MQTT rewrite with SSL fixes

- Added Arduino MQTT library support (actively maintained)
- Added support for BearSSL (core >= 2.5)
- BearSSL validation: insecure, fingerprinting and CA validation
- AxTLS validation: insecure and fingerprinting
- Support MFLN in order to reduce heap usage

* Better header incl, fix building w/ no NTP_SUPPORT

* Clean up code, use DEBUG_MSG_P

* Fix compile error

* Core 2.6.0+ fixes

* fix env -> config, run travis04 job

* don't duplicate free heap in frag data, use single stats struct

* fix dtostrf warnings, bump buffer sizes

* ...and even less words for fragmentation stat

- update every dynamicjsonbuffer with fixed size constructor argument
- change to ws callback registration to use a class builder (just cosmetic)
- test multiple ws data callbacks for each module
- remove some of the static strings in favour of ws data callback
- improve sensor ws callback data size, remove duplicated strings
- use static buffer in wsDebugSend
- postpone wsSend until loop, implement wsPost to allow other modules to queue message callbacks. remove Ticker based ws callbacks for data
- update WebUI files

* Thingspeak: async client fixes

- remove memory management in async client callbacks
- instead of global one, reference asyncclient from callback argument
- transfer temporary data-buffer to the global scope, avoid accidental String copy
- implement strnstr to search onData payload

* fixup format strings

* update retry time each attempt

* start with default attempts value

* trying to work with lwip2-536

* count time from last request

* promptly run flush

* send all ws config at once on start
* reduce ws json overhead by creating message buffer manually
* use k:[values] instead of k1:value1, k2:value2 etc. for lists