Add item piles hook for once it's v13-ready

Not entirely sure what the internal VERSION is used for, but the existing baked-in swade config is 1.0.5 so I figure might as well go up a minor.

This config is copied from https://github.com/fantasycalendar/FoundryVTT-ItemPiles/blob/ccfa2833f5cb27f7b08241419e3912234c4d6959/src/systems/swade.js with adjustments made to VERSION, ITEM_CLASS_WEAPON_TYPE, ITEM_CLASS_EQUIPMENT_TYPE, and ITEM_FILTERS (no more looting ancestries).

Implementation mirrors https://github.com/fantasycalendar/FoundryVTT-ItemPilesDnD5e/blob/master/dist/module.js

Unclear whether this is deserving of a changelog entry, tbh; it's not strictly "new" functionality, it's just ensuring that once Item Piles is on V13, no previously-functional module behavior stops working.