Folder-based move tree

[rsek]

building on #881 ; uses the compendium pack folder structure to build the move tree component, instead of dataforged.

TODO

• [x] pull in "custom moves" folder
• [x] re-implement IronFolder
  • [ ] consider moving some dataforged category => folder converters to static methods on IronFolder
• [x] update system.json to reflect that 11.313 is the minimum version
• [ ] decide whether per-category caching is worth it (it probably isn't)
  • would this be a smaller PR if i made it world-moves only? i'd have to write a helper to get ppl started... but it'd let me strip out a lot of async code :thinking:
• [ ] give the delve site sheet a pass to make sure i haven't broke it
• [ ] fix move jump link scrolling... again :sob:
• [ ] Update CHANGELOG.md

[rsek]

this PR was complicated by: https://github.com/foundryvtt/foundryvtt/issues/10034

but that bug is resolved as of 313, so i can re-implement the extended Folder class. this technically means it bumps the minor version requirement of the system; however, 313 also features an important security update, so i think that's fine