Add named color iterators and remove phf macro dependency #374

Job	Run time
Compile and test max MSRV (ubuntu-latest)	7m 21s
Quick check (beta)	1m 51s
Compile and test max MSRV (macos-latest)	6m 42s
Compile and test min MSRV (ubuntu-latest)	3m 9s
Quick check (stable)	1m 43s
Documentation	19s
Compile and test max MSRV (windows-latest)	11m 0s
Compile and test min MSRV (macos-latest)	2m 26s
Quick check (nightly)	1m 42s
Compile and test min MSRV (windows-latest)	4m 14s
integration tests (ubuntu-latest)	22s
Miri tests	5m 3s
Test #[no_std]	20s
integration tests (macos-latest)	23s
integration tests (windows-latest)	3m 29s
ci	1s
	50m 5s

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