- new on-screen widget tool UI with movable widget panel

with iOS12 compatibility

Limelight/Input/CustomOSC/LayoutOnScreenControls.m

@@ -34,7 +34,7 @@
 - (id) initWithView:(UIView*)view controllerSup:(ControllerSupport*)controllerSupport streamConfig:(StreamConfiguration*)streamConfig oscLevel:(int)oscLevel {
     [[NSNotificationCenter defaultCenter] addObserver:self
                                              selector:@selector(handleMovingOnScreenWidgetNotification:)
-                                                 name:@"OnScreenWidgetMovedByTouch"   // This is a special notification for reloading the on screen keyboard buttons. which can't be executed by _oscProfilesTableViewController.needToUpdateOscLayoutTVC code block, and has to be triggered by a notification
+                                                 name:@"OnScreenWidgetMovedByTouch"
                                                object:nil];
 
     
@@ -247,7 +247,6 @@
 - (void) touchesBegan:(NSSet *)touches withEvent:(UIEvent *)event {
     /* Reset variables related to on screen controller button drag and drop routine. These variables should be reset in 'touchesCancelled' or 'touchesEnded' but these may not be called in unaccounted-for edge cases such as when the user opens various OS-level control center related views by dragging down from the top of the screen, or dragging up from the bottom of the screen. Since Apple likes to add new control centers and new ways of opening them (i.e. Dynamic Island on iPhone 14 Pro) it's best to reset these variables here when the user is beginning a new on screen controller button drag routine  */
     
-    // [[NSNotificationCenter defaultCenter] postNotificationName:@"LegacyOscCALayerSelectedNotification" object:self];
     layerBeingDragged = nil;
     horizontalGuideline.backgroundColor = [UIColor blueColor];
     verticalGuideline.backgroundColor = [UIColor blueColor];
@@ -293,6 +292,8 @@
             layerBeingDragged = layer;
         }
         
+        if(!layerBeingDragged) return;
+        
         [[NSNotificationCenter defaultCenter] postNotificationName:@"LegacyOscCALayerSelectedNotification" object:layerBeingDragged]; // inform that a CALayer of onScreen controller has being selected
         
         /* save the name, position, and visibility of button being touched in array in case user wants to undo the change later */