More item refactor work.

src/engine/objects/AbstractGameObject.java

@@ -25,7 +25,7 @@ import java.util.concurrent.ConcurrentHashMap;
 
 public abstract class AbstractGameObject {
     private GameObjectType objectType = GameObjectType.unknown;
-    private int objectUUID;
+    public int objectUUID;
 
     private byte ver = 1;