sensor loop assumes value(index) value is ok
ref. #2543

move all checks to pre(), value() returns pre-read value
- tick() and pre() are allowed to fail specific device
- pre() would fail the sensor if any of devices fail
- value(index) is never reached unless tick() and pre() succeed

no real reason to expose internal state, just report filter readiness

ref. #2543

* garland: fix issue with division by zero in first scene setup

* garland: update setters code

* garland: fix web UI

* garland: update scene default settings

* garland: update palettes, add random run animation

* garland: enable and update anim_glow

* garland: update anim_spread

* garland: add anim_crossing

* garland: get rid of redundant variables in main class

* garland: provide anims with all palettes

* garland: unify anim_waves and anim_run to use ColorWave class

* garland: update format for color_wave.h and garland.cpp

* graland: update anim code with clear rands and auto counters

* garland: implement pixel caching for color waves to reduce redundant calculations

* garland: fix anim dolphins out of range issue

* garland: tune anim comets

* garland: combine all wave-based anims; add wave comet anim

* garland: fixes for PR notes

- update library esp8266-oled-ssd1306 to the latest version
- fix thermostat build issues
- simplify and clarify thermostat control logic
- add logs to thermostat control logic

resolve #2596

allow to use api helpers to execute something when button event happens

fix #2592 (for real this time)

cannot declare constexpr objects like that with old compiler
fix #2594

ref. #2585 and 3be53055

fix #2592

re-apply fix from #2181
resolve #2586

minimal & single-source builds should coexist yet again

also fixing leftover API dependency issues

sdk would silently cancel both

helper would block 2nd action, wifi is not enabled yet
fixing behaviour introduced in 28f3b7da8

also make boot action optional

also get rid of flashstringhelper

*should* fix most constexpr'ness issues when inlining
(but, now has a small overhead of template instantiation)