Add clang support #444

Job	Run time
Check	33s
Clippy	37s
Rustfmt	8s
MSRV	40s
spellcheck	22s
Test Suite (ubuntu-latest, stable, clang-cl)	1m 7s
Test Suite (ubuntu-latest, stable, clang)	1m 5s
Test Suite (ubuntu-latest, nightly, clang-cl)	39s
Test Suite (ubuntu-latest, nightly, clang)	1m 9s
Test Suite (macos-latest, stable, clang-cl)	1m 5s
Test Suite (macos-latest, stable, clang)	1m 5s
Test Suite (macos-latest, nightly, clang-cl)	1m 8s
Test Suite (macos-latest, nightly, clang)	1m 4s
Test Suite (windows-latest, stable, clang-cl)	14s
Test Suite (windows-latest, stable, clang)	12s
Test Suite (windows-latest, nightly, clang-cl)	23s
Test Suite (windows-latest, nightly, clang)	24s
	11m 55s

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