refactored some code for leveling up into methods
no longer using std namespace in combat, explode on levelup

need to sort out some sort of event driven ui for drawing. can't keep
setting flags. It'd be a bit easier to create some sort of event queue
where I define an event and then a handler for it, along with frames of
animations and stuff. I dunno how exactly but it's going to have to happen
if I want to make my game look good.