- moves stuff to more sane places so modules folder isn't so messy
- adds a world system that is the start of being able to data-define
world locations and having the game act differently based on which
location a map is in
there's no ability to separate 'pre-load map' (and a way for persistence
to inject this so we can have moving maps yet) but we can add it in
later since things are decently abstracted.
