* 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>