Implement absolute color conversions and chromatic adaptation #497

Job	Run time
cargo clippy (wasm32)	20s
cargo check (msrv) (wasm32)	21s
cargo check (msrv) (windows-latest)	44s
cargo clippy (windows-latest)	20s
cargo check (msrv) (macos-latest)	22s
cargo clippy (macos-latest)	21s
cargo check (msrv) (ubuntu-latest)	19s
cargo clippy (ubuntu-latest)	17s
cargo doc	16s
formatting	14s
cargo miri	1m 48s
cargo test (windows-latest)	45s
cargo test (wasm32)	18s
typos	6s
cargo test (macos-latest)	22s
cargo test (ubuntu-latest)	16s
	7m 9s

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