public static void StartListening(NetworkEventType eventType, UnityAction <InputDataHolder> listener)
        {
            AsyncEvent thisEvent = null;

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