Changes
- Add support for optional tag entries. Suffixing any tag entry with a `?` will mark it as optional, and use the vanilla `{"required": False, "id": "minecraft:foo"}` syntax.
- Add an optional `prefix_path` parameter to `ResourceManager.data()`, allowing full control over the generated resource path.
- Rewrote the documentation. The [wiki](https://github.com/alcatrazEscapee/mcresources/wiki) should now be a (mostly) comprehensive overview of the pydoc comments in the source code, with full navigation and link support.