Rework AEItemStack (#3091)

* Use itemstack as itemdef
* HIGH_TAG/LOW_TAG should be compared both directions
* Remove getTagCompound
* Make Itemlist implementation independent
* Cache item id for performance reasons
* Add preconditions to saveguard against external meddling
* Chache itemDamage
* Remove IAEStackSearchKey for now, rename getDisplayStack

src/main/java/appeng/items/misc/ItemEncodedPattern.java

@@ -229,7 +229,7 @@ public class ItemEncodedPattern extends AEBaseItem implements ICraftingPatternIt
 			return ItemStack.EMPTY;
 		}
 
-		SIMPLE_CACHE.put( item, out = details.getCondensedOutputs()[0].getItemStack() );
+		SIMPLE_CACHE.put( item, out = details.getCondensedOutputs()[0].createItemStack() );
 		return out;
 	}
 }