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* Update `c3_pro.c` * Redo layer switching logic; will default back to 0 if EEPROM reset * Update keyboards/keychron/c3_pro/c3_pro.c Co-authored-by: Joel Challis <git@zvecr.com> * Re-re-did layer switching logic * Update GPIO control functions * Apply suggestions from code review Co-authored-by: Joel Challis <git@zvecr.com> --------- Co-authored-by: Joel Challis <git@zvecr.com>