Merge pull request #673 from coderkun/master

Add method to set Unicode input key for ISO 14755

quantum/process_keycode/process_unicode.c

@@ -18,6 +18,7 @@ void set_unicode_input_mode(uint8_t os_target)
   input_mode = os_target;
 }
 
+__attribute__((weak))
 void unicode_input_start (void) {
   switch(input_mode) {
   case UC_OSX:
@@ -40,6 +41,7 @@ void unicode_input_start (void) {
   wait_ms(UNICODE_TYPE_DELAY);
 }
 
+__attribute__((weak))
 void unicode_input_finish (void) {
   switch(input_mode) {
   case UC_OSX: