Add clang support #449

Job	Run time
MSRV	36s
Check	28s
Clippy	43s
Rustfmt	3s
spellcheck	6s
Test Suite (ubuntu-latest, stable, clang-cl)	4m 54s
Test Suite (ubuntu-latest, stable, clang)	2m 59s
Test Suite (ubuntu-latest, nightly, clang-cl)	5m 23s
Test Suite (ubuntu-latest, nightly, clang)	2m 47s
Test Suite (macos-latest, stable, clang-cl)	3m 19s
Test Suite (macos-latest, stable, clang)	3m 39s
Test Suite (macos-latest, nightly, clang-cl)	4m 3s
Test Suite (macos-latest, nightly, clang)	3m 59s
Test Suite (windows-latest, stable, clang-cl)	9m 42s
Test Suite (windows-latest, stable, clang)	9m 37s
Test Suite (windows-latest, nightly, clang-cl)	9m 29s
Test Suite (windows-latest, nightly, clang)	10m 1s
	1h 11m 48s

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