feat: Moves gumps out of the core (#1916)

> [!Important]
> **Developer Note**
> This code change will **completely move gumps out of the core**


### Summary

- Adds `GetGumps()` convenience which exposes methods to Find/Close/Send multiple gumps. This helper is a performance improvement by eliminating the Dictionary<Player, List> lookup for gumps.

Projects/UOContent/Items/Misc/PromotionalToken.cs

@@ -46,7 +46,6 @@ public abstract partial class PromotionalToken : Item
         }
         else
         {
-            from.CloseGump<PromotionalTokenGump>();
             from.SendGump(new PromotionalTokenGump(this));
         }
     }
@@ -71,6 +70,8 @@ public abstract partial class PromotionalToken : Item
     {
         private readonly PromotionalToken m_Token;
 
+        public override bool Singleton => true;
+
         public PromotionalTokenGump(PromotionalToken token) : base(10, 10)
         {
             m_Token = token;