Opath

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- Packaging refresh and readme updates.

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- 130: Removed surrogate_escape handler as it's no longer
used.

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- 124: Fixed ``rmdir_p`` raising ``FileNotFoundError`` when
directory does not exist on Windows.

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- 115: Added a new performance-optimized implementation
for listdir operations, optimizing ``listdir``, ``walk``,
``walkfiles``, ``walkdirs``, and ``fnmatch``, presented
as the ``FastPath`` class.

Please direct feedback on this implementation to the ticket,
especially if the performance benefits justify it replacing
the default ``Path`` class.

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- Symlink no longer requires the ``newlink`` parameter
and will default to the basename of the target in the
current working directory.

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- 123: Implement ``Path.__fspath__`` per PEP 519.