Add Window.IsAlwaysOnTop property

Source/Engine/Platform/Base/WindowBase.h

@@ -157,6 +157,17 @@ public:
         return _maximized;
     }
 
+    /// <summary>
+    /// Gets a value that indicates whether a window is always on top of other windows.
+    /// </summary>
+    API_PROPERTY() virtual bool IsAlwaysOnTop() const;
+
+    /// <summary>
+    /// Sets a value that indicates whether a window is always on top of other windows.
+    /// </summary>
+    /// <param name="isAlwaysOnTop">True if always on top.</param>
+    API_PROPERTY() virtual void SetIsAlwaysOnTop(bool isAlwaysOnTop);
+
     /// <summary>
     /// Gets the native window handle.
     /// </summary>