Armor Class revamp!

Armor Class now works as a % damage reduction, not flat
Removed the Pixie Dust cost for resetting abilities & attributes
Caverns info panel: added loot items to the legend, blurb about auto-pickup
Nerfed Multi-shot damage
Reduced gold rewards for Inn battles
Fixed a bug resizing the game window from the Shop
(And, as usual, several other bug fixes not worth mentioning.)