Flixel 5.9.0 compat (#277)

* flixel 5.9.0 compat

* more upkeep

* fix more warnings

flixel/addons/ui/FlxUICursor.hx

@@ -334,7 +334,11 @@ class FlxUICursor extends FlxUISprite
 
 			// Ad hoc fix to avoid world coordinates on UI elements
 			if (scrollFactor.x == 0 && scrollFactor.y == 0)
+				#if (flixel < version("5.9.0"))
 				jumpToXY(FlxG.mouse.screenX, FlxG.mouse.screenY);
+				#else
+				jumpToXY(FlxG.mouse.viewX, FlxG.mouse.viewY);
+				#end
 			else
 				jumpToXY(FlxG.mouse.x, FlxG.mouse.y);
 			visible = oldVis;
@@ -962,7 +966,11 @@ class FlxUICursor extends FlxUISprite
 		{
 			#if FLX_MOUSE
 			// REALLY force it to this location
+			#if (flixel < version("5.9.0"))
 			FlxG.mouse.setGlobalScreenPositionUnsafe(pt.x, pt.y);
+			#else
+			FlxG.mouse.setRawPositionUnsafe(pt.x, pt.y);
+			#end
 
 			if (_newMouse != null)
 			{
@@ -1084,7 +1092,11 @@ class FlxUICursor extends FlxUISprite
 		if (_newMouse != null)
 		{
 			_newMouse.updateGlobalScreenPosition = true; // resume low-level-mouse updating now that I'm done overriding it
+			#if (flixel < version("5.9.0"))
 			_newMouse.setGlobalScreenPositionUnsafe(Std.int(FlxG.game.mouseX), Std.int(FlxG.game.mouseY));
+			#else
+			_newMouse.setRawPositionUnsafe(Std.int(FlxG.game.mouseX), Std.int(FlxG.game.mouseY));
+			#end
 		}
 		#end
 	}

flixel/addons/ui/FlxUIMouse.hx

@@ -23,17 +23,28 @@ class FlxUIMouse extends FlxMouse
 	 * Called by the internal game loop to update the mouse pointer's position in the game world.
 	 * Also updates the just pressed/just released flags.
 	 */
-	private override function update():Void
+	override function update():Void
 	{
-		var oldScreenX:Int = _globalScreenX;
-		var oldScreenY:Int = _globalScreenY;
-
+		#if (flixel < version("5.9.0"))
+		final oldScreenX = _globalScreenX;
+		final oldScreenY = _globalScreenY;
+		#else
+		final oldRawX = _rawX;
+		final oldRawY = _rawY;
+		#end
+
 		super.update();
 
 		if (!updateGlobalScreenPosition)
 		{
+			#if (flixel < version("5.9.0"))
 			_globalScreenX = oldScreenX;
 			_globalScreenY = oldScreenY;
+			#else
+			_rawX = oldRawX;
+			_rawY = oldRawY;
+			#end
+			updatePositions();
 		}
 	}
 }