Store GCController in Controller object to allow us to fetch controller attributes later

Limelight/Input/Controller.m

@@ -0,0 +1,13 @@
+//
+//  Controller.m
+//  Moonlight
+//
+//  Created by Cameron Gutman on 2/11/19.
+//  Copyright © 2019 Moonlight Game Streaming Project. All rights reserved.
+//
+
+#include "Controller.h"
+
+@implementation Controller
+
+@end