Pycddlib

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* Bump cddlib to latest git (f83bdbcbefbef960d8fb5afc282ac7c32dcbb482).

* Switch testing from appveyor to github actions.

* Fix release tarballs for recent linux/macos (see issues 49, 53, 54).

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* Add Python 3.10 support.

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* Extra release to fix botched tgz upload on pypi.

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* Update for cddlib 0.94m.

* Drop Python 3.5 support. Add Python 3.9 support.

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* Drop Python 2.7 support.

* Fix string truncation issue (see issue 39).

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* Expose adjacency and incidence (see issues 33, 34, and 36,
contributed by bobmyhill).

* Add Python 3.8 support.

* Drop Python 3.4 support.

* Use pytest instead of nose for regression tests.