add icons to more commonly used editor windows

Source/Editor/Windows/EditGameWindow.cs

@@ -140,6 +140,7 @@ namespace FlaxEditor.Windows
         : base(editor, true, ScrollBars.None)
         {
             Title = "Editor";
+            Icon = editor.Icons.Grid32;
 
             // Create viewport
             Viewport = new MainEditorGizmoViewport(editor)

Source/Editor/Windows/GameWindow.cs

@@ -305,6 +305,7 @@ namespace FlaxEditor.Windows
         : base(editor, true, ScrollBars.None)
         {
             Title = "Game";
+            Icon = editor.Icons.Play64;
             AutoFocus = true;
 
             var task = MainRenderTask.Instance;

Source/Editor/Windows/OutputLogWindow.cs

@@ -482,6 +482,7 @@ namespace FlaxEditor.Windows
         : base(editor, true, ScrollBars.None)
         {
             Title = "Output Log";
+            Icon = editor.Icons.Info64;
             ClipChildren = false;
             FlaxEditor.Utilities.Utils.SetupCommonInputActions(this);
 

Source/Editor/Windows/PropertiesWindow.cs

@@ -66,6 +66,7 @@ namespace FlaxEditor.Windows
         : base(editor, true, ScrollBars.Vertical)
         {
             Title = "Properties";
+            Icon = editor.Icons.Build64;
             AutoFocus = true;
 
             Presenter = new CustomEditorPresenter(editor.Undo, null, this);

Source/Editor/Windows/SceneTreeWindow.cs

@@ -48,6 +48,7 @@ namespace FlaxEditor.Windows
         : base(editor, true, ScrollBars.None)
         {
             Title = "Scene";
+            Icon = editor.Icons.Globe32;
 
             // Scene searching query input box
             var headerPanel = new ContainerControl

Source/Editor/Windows/ToolboxWindow.cs

@@ -455,6 +455,7 @@ namespace FlaxEditor.Windows
         : base(editor, true, ScrollBars.None)
         {
             Title = "Toolbox";
+            Icon = editor.Icons.Toolbox96;
 
             FlaxEditor.Utilities.Utils.SetupCommonInputActions(this);
         }