Upgrade phf to 0.9 and enable named_from_str for no_std

[Ogeon]

While upgrading phf to 0.9, I also realized that it could easily be made available with no_std by switching to the macro instead of phf_codegen.

I also noticed that I forgot to add named_gradients in the readme.

[github-actions]

Benchmark for 72c67bf

Click to view benchmark

Test	PR Benchmark	Master Benchmark	%
Cie family/lab to lch	3.0±0.00µs	3.0±0.00µs	0.00%
Cie family/lab to xyz	815.7±0.46ns	817.5±0.42ns	-0.22%
Cie family/lch to lab	2.1±0.00µs	2.1±0.00µs	0.00%
Cie family/linsrgb to xyz	3.2±0.01µs	3.2±0.00µs	0.00%
Cie family/xyz to lab	9.1±0.02µs	9.2±0.01µs	-1.09%
Cie family/xyz to yxy	616.9±0.36ns	524.7±0.28ns	+17.57%
Cie family/yxy to xyz	530.4±0.46ns	524.7±0.72ns	+1.09%
Matrix functions/matrix_inverse	11.0±0.00ns	11.4±0.01ns	-3.51%
Matrix functions/multiply_3x3	9.1±0.05ns	9.1±0.00ns	0.00%
Matrix functions/multiply_rgb_to_xyz	4.1±0.00ns	4.1±0.00ns	0.00%
Matrix functions/multiply_xyz	4.1±0.00ns	4.1±0.00ns	0.00%
Matrix functions/multiply_xyz_to_rgb	4.1±0.00ns	4.1±0.00ns	0.00%
Matrix functions/rgb_to_xyz_matrix	21.5±0.01ns	21.5±0.11ns	0.00%
Rgb family/hsl to hsv	619.8±0.28ns	621.9±2.29ns	-0.34%
Rgb family/hsl to linear hsl	8.2±0.00µs	8.2±0.01µs	0.00%
Rgb family/hsl to rgb	2.1±0.00µs	2.1±0.00µs	0.00%
Rgb family/hsv to hsl	1012.7±2.89ns	967.3±3.56ns	+4.69%
Rgb family/hsv to hwb	229.8±0.08ns	230.0±0.15ns	-0.09%
Rgb family/hsv to linear hsv	7.6±0.01µs	7.6±0.00µs	0.00%
Rgb family/hsv to rgb	2.1±0.01µs	2.1±0.00µs	0.00%
Rgb family/hwb to hsv	478.1±0.26ns	478.1±0.26ns	0.00%
Rgb family/hwb to linear hwb	9.3±0.01µs	9.3±0.06µs	0.00%
Rgb family/linear hsl to hsl	8.7±0.01µs	8.7±0.01µs	0.00%
Rgb family/linear hsv to hsv	8.2±0.01µs	8.2±0.04µs	0.00%
Rgb family/linear hwb to hwb	10.0±0.01µs	10.0±0.01µs	0.00%
Rgb family/linsrgb to rgb	4.0±0.02µs	4.0±0.00µs	0.00%
Rgb family/linsrgb_f32 to rgb_u8	5.4±0.01µs	5.4±0.01µs	0.00%
Rgb family/rgb to hsl	742.6±3.12ns	742.1±6.25ns	+0.07%
Rgb family/rgb to hsv	565.4±0.24ns	565.2±0.31ns	+0.04%
Rgb family/rgb to linsrgb	4.3±0.00µs	4.2±0.00µs	+2.38%
Rgb family/rgb_u8 to linsrgb_f32	4.6±0.00µs	4.6±0.00µs	0.00%
Rgb family/xyz to linsrgb	7.0±0.00µs	7.6±0.01µs	-7.89%

[Ogeon]

bors r+

[bors]

Build succeeded:

• ci