Start keeping track of item equip status internally (partially done)

src/Dodge/Item/Location/Initialize.hs

@@ -50,6 +50,7 @@ initCrItemLocation cr invid w it = (w & itemLocations . at locid ?~ loc
             , _ilIsRoot = False
             , _ilIsSelected = False
             , _ilIsAttached = False
+            , _ilEquipPosition = Nothing
             }