Add clang support #442

Job	Run time
Check	31s
Clippy	34s
Rustfmt	8s
MSRV	39s
Test Suite (ubuntu-latest, stable, clang-cl)	3m 10s
Test Suite (ubuntu-latest, stable, clang)	3m 22s
Test Suite (ubuntu-latest, nightly, clang-cl)	5m 7s
spellcheck	7s
Test Suite (ubuntu-latest, nightly, clang)	4m 33s
Test Suite (macos-latest, stable, clang-cl)	3m 34s
Test Suite (macos-latest, stable, clang)	2m 52s
Test Suite (macos-latest, nightly, clang-cl)	4m 42s
Test Suite (macos-latest, nightly, clang)	4m 47s
Test Suite (windows-latest, stable, clang-cl)	7m 12s
Test Suite (windows-latest, stable, clang)	7m 59s
Test Suite (windows-latest, nightly, clang-cl)	8m 41s
Test Suite (windows-latest, nightly, clang)	11m 0s
	1h 8m 58s

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