Beets-alternatives

* Resize embedded art in alternative files with `albumart_maxwidth` option.

* Consistently use Unicode paths to alternative items. This may result and
collection updates and orphaned files in alternatives. It may also improve
usability on non-standard file systems (see [74]).
* Require Python >= 3.10

[74]: https://github.com/geigerzaehler/beets-alternatives/issues/74

* Fix an issue where items in a symlink collection with relative links were
always unnecessarily updated.
* Support [Beets v2](https://beets.readthedocs.io/en/latest/changelog.html#may-30-2024)

* Add `--all` flag to update command which will update all configured
collections.

* Use the convert’s plugin [`thread` configuration][convert-config] when
transcoding files. ([johnyerhot](https://github.com/johnyerhot))
* Drop support for Python 2. Require Python >= 3.8
* Require beets >= 1.6.0

[convert-config]: https://beets.readthedocs.io/en/latest/plugins/convert.html#configuration

* Add `beet alt list-tracks` command
* SymlinkView: Fix stale symlinks not being removed when files are moved in the
main library [47][]

[47]: https://github.com/geigerzaehler/beets-alternatives/issues/47