Update existing keymaps

Update existing keymaps to enable MIDI_BASIC functionality.  Also added
an option MIDI_ENABLE_STRICT to be strict about keycode use (which also
reduces memory footprint at runtime)

quantum/process_keycode/process_music.c

@@ -42,7 +42,7 @@ static void music_noteoff(uint8_t note) {
     #endif
 }
 
-static void music_all_notes_off(void) {
+void music_all_notes_off(void) {
     #ifdef AUDIO_ENABLE
     process_audio_stop_all_notes();
     #endif