Inventory Shop for 1.2.x arrives!

Yes, it's back, whether that's good or bad is up to you.

- I can easily add new items/weapons, and even full shops (I added a spellbook shop)
- you can't fool it into getting it free or items that don't exist any more
- The shop itself is in the User Control panel. The items display in the hover (and don't display if you have no item in the slot!)