Refactored items to be more fixturey, still have more to do (like making them do their effect again heh). Added a store for buying stuffs.
refactored items to be nicer, moved more logic into gamecontroller instead of the model, added concept of 'modifiers' that track effects/buffs and paves the way for upgrades. also made them turn off correctly when their time expired, since i guess that's nice too