Add DCI-P3, DCI-P3+, and Display P3 #348

Job	Run time
Compile and test MSRV (ubuntu-latest)	9m 18s
Quick check (beta)	2m 2s
Compile and test MSRV (macos-latest)	6m 20s
Quick check (stable)	2m 6s
Documentation	25s
Compile and test MSRV (windows-latest)	12m 50s
Quick check (nightly)	1m 58s
integration tests (ubuntu-latest)	28s
integration tests (macos-latest)	30s
Miri tests	4m 2s
integration tests (windows-latest)	2m 10s
Test #[no_std]	23s
ci	1s
	42m 33s

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