* Invert UC_MOD/UC_RMOD direction when Shift is held
Also use MOD_MASK_SHIFT in process_rgb.c
* Allow audio to be played for UC_MOD, UC_RMOD keycodes as well
* Fix signedness bug in reverse input mode cycling
* Misc formatting in process_unicode_common.c
* Address clang-format issues
* Make decode_utf8 helper function file-local (static)