fix: Fixes duping containers and removes copying private setter properties (#1816)

### Summary
- Removes copying private setters
- Fixes duping containers
- Adds public `Dupe.DoDupe` functions for external scripts to hook into the existing logic.

Projects/Server/Mobiles/Mobile.cs

@@ -865,10 +865,12 @@ public partial class Mobile : IHued, IComparable<Mobile>, ISpawnable, IObjectPro
         }
     }
 
+    [IgnoreDupe]
     public bool Pushing { get; set; }
 
     public virtual bool IsDeadBondedPet => false;
 
+    [IgnoreDupe]
     public ISpell Spell
     {
         get => m_Spell;