Pyfuse3

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* Note: This is the first pyfuse3 release compatible with Cython 3.0.0 release.
Cython 0.29.x is also still supported.

* Cythonized with latest Cython 3.0.0.

* Drop Python 3.6 and 3.7 support and testing, 71.

* CI: also test python 3.12. test on cython 0.29 and cython 3.0.

* Tell Cython that callbacks may raise exceptions, 80.

* Fix lookup in examples/hello.py, similar to 16.

* Misc. CI, testing, build and sphinx related fixes.

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* cythonize with latest Cython 0.29.34 (brings Python 3.12 support)

* add a minimal pyproject.toml, require setuptools

* tests: fix integer overflow on 32-bit arches, fixes 47

* test: Use shutil.which() instead of external which(1) program

* setup.py: catch more generic OSError when searching Cython, fixes 63

* setup.py: require Cython >= 0.29

* fix basedir computation in setup.py (fix pip install -e .)

* use sphinx < 6.0 due to compatibility issues with more recent versions

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* remove support for python 3.5 (broken, out of support by python devs)

* cythonize with latest Cython 0.29.x (brings Python 3.11 support)

* use github actions for CI, remove travis-ci

* update README: minimal maintenance, not developed

* update setup.py with tested python versions

* examples/tmpfs.py: work around strange kernel behaviour (calling SETATTR after
UNLINK of a (not open) file): respond with ENOENT instead of crashing.

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* Add type annotations

* Passing a XATTR_CREATE or XATTR_REPLACE to setxattr() is now working
correctly.

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* Fix long-standing rounding error in file date handling when the nanosecond
part of file dates were > 999999500.

* There is a new `pyfuse3.terminate()` function to gracefully end the
main loop.

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* No source changes. Regenerated Cython files with Cython 0.29.21 for Python 3.9
compatibility.