Speed up ME Terminal search performance by using CompletableFuture

src/api/java/appeng/api/storage/data/IItemList.java

@@ -39,7 +39,7 @@ import appeng.api.storage.IStorageChannel;
  * - For fluids: AEApi.instance().storage().getStorageChannel( IFluidStorageChannel.class).createList()
  * - Replace with the corresponding {@link IStorageChannel} type for non native channels
  */
-public interface IItemList<T extends IAEStack<T>> extends IItemContainer<T>, Iterable<T>
+public interface IItemList<T extends IAEStack<T>> extends IItemContainer<T>, Iterable<T>, Cloneable
 {
 
 	/**
@@ -85,4 +85,9 @@ public interface IItemList<T extends IAEStack<T>> extends IItemContainer<T>, Ite
 	 * resets stack sizes to 0.
 	 */
 	void resetStatus();
-}
+
+	/**
+	 * create a copy of this list.
+	 */
+	IItemList<T> clone();
+}