public static void StartListening(string eventName, UnityAction <string> listener)
        {
            GameKeyEvent thisEvent = null;

            if (instance.eventDictionary.TryGetValue(eventName, out thisEvent))
            {
                thisEvent.AddListener(listener);
            }
            else
            {
                thisEvent = new GameKeyEvent();
                thisEvent.AddListener(listener);
                instance.eventDictionary.Add(eventName, thisEvent);
            }
        }