Pkgcore

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- pkgcore.ebuild.cpv: Fix rejecting valid package names that resemble
version strings or contain a sequence of multiple hyphens.

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- pkgcore.ebuild.repo_objs: Support profile-eapis-banned
and profile-eapis-deprecated metadata fields (GLEP 82).

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- ebd: Start pkg_* phases in a dedicated empty directory required by EAPI 8
(313).

- ebd: Fix typo in econf --libdir logic (318).

- pkgcore.ebuild.repo_objs: Support eapis-testing metadata field (GLEP 82).

- pkgcore.ebuild.atom: Explicitly handle empty string when parsing.

- pkgcore.ebuild.repository: Inject parent repo arches as keywords for provided
pkgs (312).

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- pkgcore.ebuild.profiles: Provide raw access to make.defaults data for pkgcheck.

- Leverage USE_EXPAND flag ordering from repo to sort output.

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- Add initial EAPI 8 support.

- pkgcore.ebuild.formatter: Drop paludis formatter support.

- pkgcore.ebuild.processor: Register ebd cleanup signal handlers on the main
thread during init to avoid inadvertent issues with 3rd party usage (e.g.
pkgcore pytest plugin gets autoloaded).

- Rework fetch support to allow custom DISTDIR targets.

- pmaint: Drop mirror subcommand support.

- pshowkw: Move to ``pkgdev showkw``.

- Simplify config-related options by dropping --empty-config in favor of using
false-valued boolean args to --config. For example, use ``--config no`` or
``--config false`` to disable loading the system config where previously
--empty-config would be used.

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- pmaint sync: Fix syncing raw repos.

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