/// <summary>
 /// Removes an item from the world. Also takes care of physics removal.
 /// </summary>
 /// <param name="item">The item to remove</param>
 public void Remove(Item item)
 {
     Items.Remove(item);
     entityManager.RemoveEntity(item);
     physics.RemovePhysicsEntity(item.GetBox());
 }
 /// <summary>
 /// Adds an item to the item manager. Takes care of setting the item up for the physics engine and game environment
 /// </summary>
 /// <param name="item"></param>
 public void Add(Item item)
 {
     Items.Add(item);
     entityManager.AddEntity(item);
     physics.AddPhysicsEntity(item.GetBox());
 }