Ender Lasso: Add teleporting.

Bug: The entity disappears if the target chunk is unloaded.
Ender Lasso: Clean up some debug code.
Ender Lasso: Some refactoring once again...
Fiddling and refactoring. TP between OV & Nether should work, End doesn't.
Add Ender Arrow item. Can be bound and unbound. No other functionality yet.
Some teleport refactoring + make the Ender Arrow teleport randomly on attack.
Commit the debug stuff. chunkExists() (chunk coords!) seems to be the thing.
Ender Lasso: Chunk Loading almost working!

Everything else seems to work, except from Nether/Overworld TO The End
it only works once after logging in.
There is a message on the chat about unloading dimension 1 after the first
entity teleports to The End.