Merge remote-tracking branch 'origin/gi' into large-worlds

# Conflicts:
#	Source/Engine/Core/Math/Vector3.h

Source/Engine/UI/GUI/Control.cs

@@ -313,7 +313,7 @@ namespace FlaxEngine.GUI
         /// <summary>
         /// Gets the control DPI scale factor (1 is default). Includes custom DPI scale.
         /// </summary>
-        public float DpiScale => RootWindow?.Window.DpiScale ?? Platform.DpiScale;
+        public float DpiScale => RootWindow?.Window?.DpiScale ?? Platform.DpiScale;
 
         /// <summary>
         /// Gets screen position of the control (upper left corner).