- Replace `:` with `&` in release pair string, add data sub-directory for index data.
- Make class `Release` and `ReleasePair` frozen and hashable.
- Support deprecated decorator, see [PEP-702](https://peps.python.org/pep-0702/).
**Full Changelog**: https://github.com/StardustDL/aexpy/compare/v0.3.6...v0.3.7