Add support for Python's "Limited API"; Test cibuildwheel and py >=3.5 using `TestPythonSML.py` #437

Job	Run time
build-windows	10m 33s
build-*nix (ubuntu-latest)	5m 13s
wheel-*nix (ubuntu-latest)	6m 6s
build-*nix (macos-12)	8m 48s
build-*nix (macos-latest)	5m 6s
wheel-*nix (macos-12)	3m 54s
wheel-*nix (macos-latest)	2m 29s
wheel-*nix (windows-latest)	6m 55s
Test wheel on all python versions (ubuntu-20.04, 5)	10s
Test wheel on all python versions (ubuntu-20.04, 6)	13s
Test wheel on all python versions (ubuntu-20.04, 7)	12s
Test wheel on all python versions (ubuntu-20.04, 8)	5s
Test wheel on all python versions (ubuntu-20.04, 9)	4s
Test wheel on all python versions (ubuntu-20.04, 10)	4s
Test wheel on all python versions (ubuntu-20.04, 11)	4s
Test wheel on all python versions (ubuntu-20.04, 12)	6s
Test wheel on all python versions (macos-12, 5)	21s
Test wheel on all python versions (macos-12, 6)	24s
Test wheel on all python versions (macos-12, 7)	7s
Test wheel on all python versions (macos-12, 8)	7s
Test wheel on all python versions (macos-12, 9)	9s
Test wheel on all python versions (macos-12, 10)	11s
Test wheel on all python versions (macos-12, 11)	11s
Test wheel on all python versions (macos-12, 12)	9s
Test wheel on all python versions (macos-latest, 8)	34s
Test wheel on all python versions (macos-latest, 9)	9s
Test wheel on all python versions (macos-latest, 10)	8s
Test wheel on all python versions (macos-latest, 11)	7s
Test wheel on all python versions (macos-latest, 12)	7s
Publish to pypi.org	0s
Publish to test.pypi.org	0s
	52m 46s

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