* Crkbd: move I2C and Serial defines to keyboard's config.h
per @drashna on Discord
* Crkbd: remove misleading comment re: I2C and Serial
USE_I2C and USE_SERIAL are usually a "one or the other"-type deal, but this keyboard uses both.
* Remove chording as it is not documented, not used, and needs work.
* Make Leader Key an optional feature.
* Switch from `PREVENT_STUCK_MODIFIERS` to `STRICT_LAYER_RELEASE`
* Remove `#define PREVENT_STUCK_MODIFIERS` from keymaps.
* improvement of crkbd communication functions (based on helix-keyboard)
* Removed unnecessary code.
* Changed read restriction from #define to #pragma once.
* Changed from sizeof to defined size.
* moved lib folder to crkbdroot.
removed warning of ws2812.d
