Magick Shoppe, coins, look(), and more

-added a macgick shoppe in McKay's lab
-use coins to buy items
-start with 100 coins
-get coins for doing things in game
-added anti-cheat (sort of)
-added look method. First time player visits location they get the full
description. Every other time it is a shortened one. If the player types
look it will give them the full description
-used arraylist<> to store items the player buys
-a call to inventory will display both items the player picks up as well
as the ones they bought. (will eventually just have all items added to a
single arrayList)
-code refactoring