Monospace Support for Rich Text (#33830)

* Initial Commit

* Moved all this to SS14 on it's own

* Added prototype validation

Content.Client/Paper/UI/PaperWindow.xaml.cs

@@ -9,6 +9,7 @@ using Robust.Client.UserInterface.Controls;
 using Robust.Client.UserInterface.XAML;
 using Robust.Shared.Utility;
 using Robust.Client.UserInterface.RichText;
+using Content.Client.UserInterface.RichText;
 using Robust.Shared.Input;
 
 namespace Content.Client.Paper.UI
@@ -43,7 +44,8 @@ namespace Content.Client.Paper.UI
             typeof(BulletTag),
             typeof(ColorTag),
             typeof(HeadingTag),
-            typeof(ItalicTag)
+            typeof(ItalicTag),
+            typeof(MonoTag)
         };
 
         public event Action<string>? OnSaved;