Merge more UI refactor stuff (#11277)

* Changelog+options ui controller
* Sandbox UI controller
* Escape menu UI controller

Content.Client/Changelog/ChangelogWindow.xaml.cs

@@ -1,6 +1,7 @@
 using System.Linq;
 using Content.Client.Resources;
 using Content.Client.Stylesheets;
+using Content.Client.UserInterface.Systems.EscapeMenu;
 using Content.Shared.Administration;
 using JetBrains.Annotations;
 using Robust.Client.AutoGenerated;
@@ -204,7 +205,7 @@ namespace Content.Client.Changelog
 
         public void Execute(IConsoleShell shell, string argStr, string[] args)
         {
-            new ChangelogWindow().OpenCentered();
+            IoCManager.Resolve<IUserInterfaceManager>().GetUIController<ChangelogUIController>().ToggleWindow();
         }
     }
 }