Pathlib-abc

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- When ``magic_open()`` is called to open a path in binary mode, raise
``ValueError`` if any of the *encoding*, *errors* or *newline* arguments
are given.
- In ``ReadablePath.glob()``, raise ``ValueError`` when given an empty
pattern.
- In ``ReadablePath.glob()`` and ``JoinablePath.full_match()``, stop
accepting ``JoinablePath`` objects as patterns. Only strings are allowed.
- In ``ReadablePath.copy()`` and ``copy_into()``, stop accepting strings as
target paths. Only ``WritablePath`` objects are allowed.

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- Several months worth of upstream refactoring:

- Rename ``PurePathBase`` to ``JoinablePath``.
- Split ``PathBase`` into ``ReadablePath`` and ``WritablePath``.
- Replace ``stat()`` with ``info`` attribute and ``PathInfo`` protocol.
- Remove many nonessential methods.
- Add support for copying between path instances.

- Drop support for Python 3.7 and 3.8.

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- Add support for Python 3.7.

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- Rename ``PathModuleBase`` to ``ParserBase``, and ``PurePathBase.pathmod``
to ``PurePathBase.parser``.
- Add ``ParserBase.splitext()``.
- Add ``PurePathBase.full_match()``.
- Treat a single dot ("``.``") as a valid file extension.
- Revert ``match()`` back to 3.12 behaviour (no recursive wildcards).
- Replace ``PathBase.glob(follow_symlinks=...)`` with ``recurse_symlinks=...``.
- Suppress all ``OSError`` exceptions from ``PathBase.exists()`` and
``is_*()`` methods.
- Disallow passing ``bytes`` to initialisers.
- Improve walking and globbing performance.
- Expand test coverage.
- Clarify that we're using the PSF license.

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- Add ``PathModuleBase`` ABC to support path syntax customization.
- Add CI. Thank you Edgar Ramírez Mondragón!
- Return paths with trailing slashes if a glob pattern ends with a slash.
- Return both files and directory paths if a glob pattern ends with ``**``,
rather than directories only.
- Improve ``PathBase.resolve()`` performance by avoiding some path object
allocations.
- Remove ``PurePathBase.is_reserved()``.
- Remove automatic path normalization. Specifically, the ABCs no longer
convert alternate separators nor remove either dot or empty segments.
- Remove caching of the path drive, root, tail, and string.
- Remove deprecation warnings and audit events.

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- Improve globbing performance by avoiding re-initialising path objects.
- Add docs.