Additional functionality.

PkmnLibSharp/Library/Items/ItemLibrary.cs

@@ -66,6 +66,19 @@ namespace PkmnLibSharp.Library.Items
             _cache.Add(key, item);
             return item;
         }
+        
+        public IEnumerable<Item> GetEnumerator()
+        {
+            var count = Creaturelib.Generated.ItemLibrary.GetCount(Ptr);
+            var ptr = IntPtr.Zero;
+            for (ulong i = 0; i < count; i++)
+            {
+                Creaturelib.Generated.ItemLibrary.GetAtIndex(Ptr, i, ref ptr).Assert();
+                if (TryResolvePointer(ptr, out Item? item))
+                    yield return item!;
+                yield return new Item(ptr);
+            }
+        }
 
         protected internal override void MarkAsDeleted()
         {