Consumables now work!  You start with a potato in your inventory which
will heal you for all of 1 point of damage (sometimes 0).  Also changed
the way which things like health, armor, etc. are stored so that they
can be accessed by index, allowing consumables to work.  Cons also have
a type now, which tells what they are allowed to do (e.g. things that
restore aren't allowed to go above the maximum value).