Changed the way looking works, not done
ask for everything in a range or just the fringe
working on looking and moving.
running version
fixed save bug
Vision System + Difference System

Large changes to the vision system

- Creatures register with tiles nearby, and receive updates when
creatures enter / leave those tiles
- When moving, only tiles that are "new" are sent
- Creatures are part of a field now on the client side, no longer
separate. (Might want to change that again later, but for now this is a
good solution.)

Needs a lot of commenting done, but I don't wanna right now.
Merged version
tick is no longer needed
Version change so maybe I can sync..