This greatly improves performance as it drastically reduces the amount
of Entities and Tile Entities that are "registered" into the world, as
purely "cached" chunks will no longer have their entities hanging out in the world.
Additionally this fixes our Entity Add To World and Entity Remove From World events
Those events have not been firing correctly since MC changed how chunks work here.
Now the server will only consider a chunk "loaded" if it's got a ticket putting
it at level 33 or lower, which matches the public Bukkit API.
