Implement input proxy. Change input callback delegate to event. Prevents repeated (de)activation.

Assets/Cryville/Common/Unity/Input/UnityKeyHandler.cs

@@ -9,19 +9,19 @@ namespace Cryville.Common.Unity.Input {
 
 		public UnityKeyHandler() { }
 
-		public override void Activate() {
+		protected override void ActivateImpl() {
 			receiver = new GameObject("__keyrecv__");
 			recvcomp = receiver.AddComponent<T>();
-			recvcomp.SetCallback(OnInput);
+			recvcomp.SetCallback(Feed);
 		}
 
-		public override void Deactivate() {
+		protected override void DeactivateImpl() {
 			if (receiver) GameObject.Destroy(receiver);
 		}
 
 		public override void Dispose(bool disposing) {
 			if (disposing) {
-				Deactivate();
+				DeactivateImpl();
 			}
 		}