started implementing on-screen controls

- directional pad works
- a,b,x,y work

Limelight/Input/OnScreenControls.h

@@ -0,0 +1,16 @@
+//
+//  OnScreenControls.h
+//  Limelight
+//
+//  Created by Diego Waxemberg on 12/28/14.
+//  Copyright (c) 2014 Limelight Stream. All rights reserved.
+//
+
+#import <Foundation/Foundation.h>
+
+@interface OnScreenControls : NSObject
+
+- (id) initWithView:(UIView*)view;
+- (void) handleTouchDownEvent:(UIEvent*)event;
+- (void) handleTouchUpEvent:(UIEvent*) event;
+@end