Remove the tool block from the main menu

Authoring tools open from the in-game toolbar only. Menu and test drivers quit
through ApplicationExit.

test_suites/new_game/src/NewGameTestDriverNode.cs

@@ -356,7 +356,7 @@ namespace Mods.NewGameTest
             foreach (var failure in failures)
                 GameLogger.Log("TEST", $"NewGameTest: failed: {failure}");
             GameLogger.Log("TEST", $"[TEST_RESULT] name=new_game passed={passed} failed={failures.Count}");
-            GetTree().Quit(failures.Count == 0 ? 0 : 1);
+            Cthangover.Core.Bootstrap.ApplicationExit.Quit(GetTree(), failures.Count == 0 ? 0 : 1);
         }
     }
 }