Moved more over to the wrapper and added the set_keyboard_repeat function to the tcod wrapper
Made Object not depend on field.
Added some utility functions to field, such as in_bounds to check if a coord is on the map, and get_objects_at to get everything at a location.
can_walk now checks so you can't walk outside the map, and that there are no living objects you're about to hit.
Living now has some default parameters.