Adds option to use persistent settings over defualt viewport options

Signed-off-by: Tyler Gregorcyk <tyler@gregorcyk.com>

Source/Editor/Options/ViewportOptions.cs

@@ -136,6 +136,13 @@ namespace FlaxEditor.Options
         [DefaultValue(50.0f), Limit(25.0f, 500.0f, 5.0f)]
         [EditorDisplay("Defaults"), EditorOrder(220), Tooltip("The default editor viewport grid scale.")]
         public float ViewportGridScale { get; set; } = 50.0f;
+        
+        /// <summary>
+        /// Gets or sets the use persistence over defaults setting
+        /// </summary>
+        [DefaultValue(true)]
+        [EditorDisplay("Defaults"), EditorOrder(230), Tooltip("Allow persistence setting from last session to override default settings")]
+        public bool UsePersistenceOverDefaults { get; set; } = true;
 
         /// <summary>
         /// Gets or sets the view distance you can see the grid.

Source/Editor/Windows/EditGameWindow.cs

@@ -450,6 +450,9 @@ namespace FlaxEditor.Windows
         /// <inheritdoc />
         public override void OnLayoutDeserialize(XmlElement node)
         {
+            if (!Editor.Options.Options.Viewport.UsePersistenceOverDefaults)
+                return;
+            
             if (bool.TryParse(node.GetAttribute("GridEnabled"), out bool value1))
                 Viewport.Grid.Enabled = value1;
             if (bool.TryParse(node.GetAttribute("ShowFpsCounter"), out value1))