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.h

@@ -14,6 +14,7 @@ void music_off(void);
 
 void music_on_user(void);
 void music_scale_user(void);
+void music_all_notes_off(void);
 
 void matrix_scan_music(void);