Pkgcore

- Better reporting of issues during manifest operation over a repository (arthurzam)

- ebd: helpers: allow zstd for prepalldocs/prepinfo/prepman (thesamesam, 358)
- pquery: fix ``--maintainer maintainer-needed`` (arthurzam, 359)
- Modernize all the tests to use pytest (arthurzam)
- ebuild: improve malformed atom error messages (arthurzam)
- bash completion: add for pquery (arthurzam, 360)
- metadata.xsd: import ``savannah``, ``savannah-non-gnu``, ``freedesktop-gitlab``, ``gnome-gitlab`` remote-ids (mattst88, 363)

- Fix checking whether a path is contained within a known repository (specifically: fix the test to not check if path is prefixed with a repository's location. Instead, we check the full path). Previously, ``/usr/portage-dir`` would wrongly be considered within ``/usr/portage``, which is clearly wrong. (arthurzam, 350)
- Various code cleanups and refactoring (arthurzam, 351)
- ebuild/atom.py: fix ``atom.no_usedeps`` not including subslot (arthurzam, 353)
- Fix and port pkgcore to Python 3.11 (arthurzam, thesamesam, 355)

- metadata.xsd: drop obsolete gitorious, sourceforge-jp remote-ids (ulm, 344)
- metadata.xsd: import hackage, sourcehut remote-ids (thesamesam , 348)

- pkgcore.ebuild.ebuild: warn about deprecated `ECLASS-VARIABLE` tag (ulm, 337)
- pkgcore.ebuild: properly close resources (laumann, 339, 340)
- pkgcore.ebuild.repository: fix inheriting license groups. Fixes e.g. pquery usage on overlays. (arthurzam, 341)
- metadata.xsd: sync with proj/xml-schema repository (ulm, 342)