Add clang support #439

Job	Run time
Clippy	49s
Rustfmt	5s
Check	29s
spellcheck	10s
MSRV	40s
Test Suite (ubuntu-latest, stable, clang-cl)	1m 50s
Test Suite (ubuntu-latest, stable, clang)	2m 6s
Test Suite (ubuntu-latest, nightly, clang-cl)	2m 6s
Test Suite (ubuntu-latest, nightly, clang)	2m 5s
Test Suite (macos-latest, stable, clang-cl)	2m 8s
Test Suite (macos-latest, stable, clang)	1m 48s
Test Suite (macos-latest, nightly, clang-cl)	2m 7s
Test Suite (macos-latest, nightly, clang)	2m 5s
Test Suite (windows-latest, stable, clang-cl)	21s
Test Suite (windows-latest, stable, clang)	57s
Test Suite (windows-latest, nightly, clang-cl)	1m 8s
Test Suite (windows-latest, nightly, clang)	1m 18s
	22m 12s

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