* add rgblight_set_effect_range()
* implement effect range
* Arrange the order of function list in rgblight.h .
* update docs/feature_rgblight.md
* fix RGBLIGHT_RAINBOW_SWIRL_RANGE default value
* add example code about Utility Functions
* add example code about direct operation functions
* When RGBLIGHT_SPLIT is defined, the following function has no meaning and is invalidated.
* rgblight_setrgb_master(r, g, b)
* rgblight_setrgb_slave(r, g, b)
* rgblight_sethsv_master(h, s, v)
* rgblight_sethsv_slave(h, s, v)
* add temporary test code for rgblight_set_effect_range
* fix rgblight_effect_knight() bug
* Test End. Revert "add temporary test code for rgblight_set_effect_range"
This reverts commit 5680cddd012d68b2db75a532862a7fef250f8973.
670a9b7f83