Initial patrol state, editor
Need to do a proper rewrite of the actor movement stuff before this
works properly though. We should be sharing a lot of code here rather
than re-writing the same thing across multiple states, and ideally we
should be able to queue up positions to move to.
https://files.facepunch.com/alexguthrie/1b1311b1/sbox-dev_AEtQOhETj3.png