Add rumble support on iOS 14

Limelight/Input/HapticContext.h

@@ -0,0 +1,20 @@
+//
+//  HapticContext.h
+//  Moonlight
+//
+//  Created by Cameron Gutman on 9/17/20.
+//  Copyright © 2020 Moonlight Game Streaming Project. All rights reserved.
+//
+
+@import CoreHaptics;
+@import GameController;
+
+@interface HapticContext : NSObject
+
+-(void)setMotorAmplitude:(unsigned short)amplitude;
+-(void)cleanup;
+
++(HapticContext*) createContextForHighFreqMotor:(GCController*)gamepad;
++(HapticContext*) createContextForLowFreqMotor:(GCController*)gamepad;
+
+@end