Path

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- Refreshed package metadata.

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- Added ``ExtantPath`` and ``ExtantFile`` objects that raise
errors when they reference a non-existent path or file.

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- Refreshed package metadata.

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- Removed ``__version__`` property. To determine the version,
use ``importlib.metadata.version('path')``.

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- Fixed regression on Python 3.7 and earlier where ``lru_cache``
did not support a user function.

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- Removed ``namebase`` property. Use ``stem`` instead.
- Removed ``update`` parameter on method to
``Path.merge_tree``. Instead, to only copy newer files,
provide a wrapped ``copy`` function, as described in the
doc string.
- Removed ``FastPath``. Just use ``Path``.
- Removed ``path.CaseInsensitivePattern``. Instead
use ``path.matchers.CaseInsensitive``.
- Removed ``path.tempdir``. Use ``path.TempDir``.
- 154: Added ``Traversal`` class and support for customizing
the behavior of a ``Path.walk``.