Here's the intial implementation of the unclaimed chunk finder

It should do a search for chunks every 5 seconds. If it finds any it adds it to a list of unclaimed chunks, that the command accesses to teleport people.

When a chunk is retrieved from the list, it is also removed from the list. This will avoid 2 players teleporting to the same chunk.

I have some ideas to implement to this still, but I'm off to sleep and just wanted to submit the pull request before I did. In its current form it should work though :)