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

Limelight/Input/Controller.h

@@ -0,0 +1,24 @@
+//
+//  Controller.h
+//  Moonlight
+//
+//  Created by Cameron Gutman on 2/11/19.
+//  Copyright © 2019 Moonlight Game Streaming Project. All rights reserved.
+//
+
+@import GameController;
+
+@interface Controller : NSObject
+
+@property (nullable, nonatomic, retain) GCController* gamepad;
+@property (nonatomic)                   int playerIndex;
+@property (nonatomic)                   int lastButtonFlags;
+@property (nonatomic)                   int emulatingButtonFlags;
+@property (nonatomic)                   unsigned char lastLeftTrigger;
+@property (nonatomic)                   unsigned char lastRightTrigger;
+@property (nonatomic)                   short lastLeftStickX;
+@property (nonatomic)                   short lastLeftStickY;
+@property (nonatomic)                   short lastRightStickX;
+@property (nonatomic)                   short lastRightStickY;
+
+@end