Implement basic windowing on Mac

Source/Engine/Platform/Mac/MacUtils.h

@@ -0,0 +1,15 @@
+// Copyright (c) 2012-2021 Wojciech Figat. All rights reserved.
+
+#pragma once
+
+#include "Engine/Core/Types/String.h"
+#include <CoreFoundation/CoreFoundation.h>
+
+class FLAXENGINE_API MacUtils
+{
+public:
+    static String ToString(CFStringRef str);
+    static CFStringRef ToString(const String& str);
+    static Vector2 PosToCoca(const Vector2& pos);
+    static Vector2 GetScreensOrigin();
+};