async mouse move event for relative touch handler

Limelight/Input/RelativeTouchHandler.h

@@ -16,6 +16,7 @@ NS_ASSUME_NONNULL_BEGIN
 
 @interface RelativeTouchHandler : UIResponder
 @property (nonatomic, readonly) CustomTapGestureRecognizer* mouseRightClickTapRecognizer; // this object will be passed to onscreencontrol class for areVirtualControllerTaps flag setting
+@property (nonatomic, strong) CADisplayLink *displayLink;
 
 
 + (void) testMethod;