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* add functions to set specific backlight state * add function to query backlight state * update documentation with new backlight functions * Update tmk_core/common/backlight.c Co-Authored-By: codyd51 <phillip.ennen@gmail.com> * Update tmk_core/common/backlight.h Co-Authored-By: codyd51 <phillip.ennen@gmail.com> * update docs for is_backlight_enabled() name change