Add struct enumerator to AetheryteList

Dalamud/Game/ClientState/Aetherytes/AetheryteList.cs

@@ -87,10 +87,7 @@ internal sealed partial class AetheryteList
     /// <inheritdoc/>
     public IEnumerator<IAetheryteEntry> GetEnumerator()
     {
-        for (var i = 0; i < this.Length; i++)
+        return new Enumerator(this);
-        {
-            yield return this[i];
-        }
     }
 
     /// <inheritdoc/>
@@ -98,4 +95,30 @@ internal sealed partial class AetheryteList
     {
         return this.GetEnumerator();
     }
+
+    private struct Enumerator(AetheryteList aetheryteList) : IEnumerator<IAetheryteEntry>
+    {
+        private int index = 0;
+
+        public IAetheryteEntry Current { get; private set; }
+
+        object IEnumerator.Current => this.Current;
+
+        public bool MoveNext()
+        {
+            if (this.index == aetheryteList.Length) return false;
+            this.Current = aetheryteList[this.index];
+            this.index++;
+            return true;
+        }
+
+        public void Reset()
+        {
+            this.index = 0;
+        }
+
+        public void Dispose()
+        {
+        }
+    }
 }