* 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 README.md - add garland description
- Add new animation - Dolphins

Port of https://github.com/Vasil-Pahomov/ArWs2812 from Arduino to ESP8266
Implementing garland of WS2812

Co-authored-by: Dmitry Blinov <dblinov@blackberry.com>