Overhaul item and inventory and clean up bits and pieces

Zennysoft.Game.Ma.Implementation/Item/RescuedItemDatabase.cs

@@ -7,10 +7,10 @@ namespace Zennysoft.Ma.Adapter;
 public partial class RescuedItemDatabase
 {
   [Save("rescued_item_list")]
-  public List<InventoryItem> Items { get; init; }
+  public List<IBaseInventoryItem> Items { get; init; }
 
   public RescuedItemDatabase()
   {
-    Items = new List<InventoryItem>();
+    Items = new List<IBaseInventoryItem>();
   }
 }