Apollo

Fully migrated overlay conditions over to the Resource Loader API. In addition, I've made pack overlays function in builtin resource packs (which ended up being a very small change code-wise).

> Resource conditions are the correct tool for the job here IMO, not a new system that is essentially a copy. Resource conditions still only apply to some datapack files...

Made the initial jump to Resource Conditions, will work on handling unsupported overlay conditions (such as the aforementioned `features_enabled` and `tags_populated` conditions) next.

Most of the unsupported overlay conditions ended up already giving a warning in the logs and returning false for when datapack contents haven't been initialized yet. I've applied it to...

Superceded by #3702 to target 1.20.5.

CTOV issue. Both Fabric Waystones *and* CTOV add waystones to CTOV villages, so CTOV just needs to remove their injection.

Don't worry about it, this issue is invisible without actually looking at the code :P

Use [Cyclic Crash Fixer](https://modrinth.com/mod/cyclic-crash-fixer/) until Cyclic fixes the issue themselves (#2387)

Will be fixed in #2402

> Could a conventional datapack be made that datapackers can depend on? Alternatively, if datapacks replace the wolf variant JSON themselves with the same file as would be used by...