Disable iOS 13.4+ mouse support on iOS 14 in preparation for GCMouse work

Limelight/Input/StreamView.m

@@ -76,7 +76,11 @@ static const int REFERENCE_HEIGHT = 720;
         [onScreenControls setLevel:level];
     }
     
-    if (@available(iOS 13.4, *)) {
+    if (@available(iOS 14.0, *)) {
+        // Use the new GCMouse API on iOS 14
+    }
+    else if (@available(iOS 13.4, *)) {
+        // Use the legacy mouse API on iOS 13.4
         [self addInteraction:[[UIPointerInteraction alloc] initWithDelegate:self]];
         
         UIPanGestureRecognizer *mouseWheelRecognizer = [[UIPanGestureRecognizer alloc] initWithTarget:self action:@selector(mouseWheelMoved:)];
@@ -179,6 +183,11 @@ static const int REFERENCE_HEIGHT = 720;
     if (@available(iOS 13.4, *)) {
         UITouch* touch = [touches anyObject];
         if (touch.type == UITouchTypeIndirectPointer) {
+            if (@available(iOS 14.0, *)) {
+                // We'll handle this with GCMouse. Do nothing here.
+                return YES;
+            }
+            else {
                 UIEventButtonMask changedButtons = lastMouseButtonMask ^ event.buttonMask;
                             
                 for (int i = BUTTON_LEFT; i <= BUTTON_X2; i++) {
@@ -207,6 +216,7 @@ static const int REFERENCE_HEIGHT = 720;
                 return YES;
             }
         }
+    }
 #endif
     
     return NO;
@@ -217,6 +227,11 @@ static const int REFERENCE_HEIGHT = 720;
     if (@available(iOS 13.4, *)) {
         UITouch *touch = [touches anyObject];
         if (touch.type == UITouchTypeIndirectPointer) {
+            if (@available(iOS 14.0, *)) {
+                // We'll handle this with GCMouse. Do nothing here.
+                return;
+            }
+            else {
                 // We must handle this event to properly support
                 // drags while the middle, X1, or X2 mouse buttons are
                 // held down. For some reason, left and right buttons
@@ -227,6 +242,7 @@ static const int REFERENCE_HEIGHT = 720;
                 return;
             }
         }
+    }
 #endif
     
     hasUserInteracted = YES;