Quick Slots, Better Menu Input

quick slots feature complete; hud input is now better limited (still
need to apply this to the character menu); fixed stat issue with charms
(was still looking for user status rather than equip status); fixed
multislot equipment issue (was still moving already-equipped instances
instead of destroying and recreated)
Menu & Instance Deactivation; Levelup Derived Stats; Game Mode Constants; Smart Equip Mode Selection

menu now correctly deactivates instances when opened (needs a pause
background image); fixed menu rescale correction to correctly only occur
when window has been resized; equip mode now makes selection the
currently equipped item (if slot has an equipped item); can now equip 0
quantity items (why not?); use quick item from play mode; committing
attribute allocation and respeccing now properly update derived stats