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/Items/Item.cs

@@ -3381,9 +3381,15 @@ public class Item : IHued, IComparable<Item>, ISpawnable, IObjectPropertyListEnt
                 continue;
             }
 
+            var setMethod = p.GetSetMethod(false);
+
             try
             {
-                p.SetValue(dest, p.GetValue(src, null), null);
+                // Do not copy private properties
+                if (setMethod != null)
+                {
+                    p.SetValue(dest, p.GetValue(src, null), null);
+                }
             }
             catch
             {

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;

Projects/Server/Utilities/ActivatorExtensions.cs

@@ -123,7 +123,7 @@ public static class ActivatorExtensions
     {
         var argLength = args?.Length ?? 0;
 
-        var types = argLength > 0 ? new Type[argLength] : Array.Empty<Type>();
+        var types = argLength > 0 ? new Type[argLength] : [];
         for (int i = 0; i < types.Length; i++)
         {
             types[i] = args![i]?.GetType();
@@ -139,7 +139,7 @@ public static class ActivatorExtensions
         object[] paramArgs;
         if (paramCount == 0)
         {
-            paramArgs = Array.Empty<object>();
+            paramArgs = [];
         }
         else if (argLength == paramCount)
         {