add an "isModifierActive" to the hid facade

src/key_events.cpp

@@ -117,7 +117,9 @@ void releaseKey(Key mappedKey) {
   releaseKeyRaw(mappedKey);
 }
 
-
+boolean isModifierKeyActive(Key mappedKey) {
+  return Keyboard.isModifierActive(mappedKey.keyCode);
+}
 
 void sendKeyboardReport() {
   Keyboard.sendReport();

src/key_events.h

@@ -56,6 +56,8 @@ void releaseKeyRaw(Key mappedKey);
 /** Flushes any pending regular key switch events and sends them out */
 void sendKeyboardReport();
 
+boolean isModifierKeyActive(Key mappedKey);
+
 void initializeConsumerControl();
 
 void pressConsumer(Key mappedKey);