Potions and Scrolls

I've just started implementing the use of potions and scrolls. They will follow the usual roguelike convention, i.e. they start off scrambled and can have a "{tried}" status if they produce no obvious effects. The list of potions and scrolls I intend to implement at first is given here.

One additional piece of functionality which I'd like to implement but will probably not for the time being is adding the standard roguelike shortcut of (q)uaffing an item by assigning keyboard shortcuts on the inventory (as opposed to the current method of dragging the item onto the small icon (shown above)). This will require some refactoring.