Changes

If a unique identifier is not found, the client steps back to the next broader identifier, i.e. "img.texture.house.wall.solid" becomes "img.texture.house.wall", then "img.texture.house", "img.texture" and finally "img". This stepping-back continues as long as the client has either found a resource or reached the top of this "resource chain" -- in that case it will use either a dummy texture (red X on white square) or the famous question mark bag.