More gamut mapping

[natural-harmonia-gropius]

• [x] https://github.com/jedypod/gamut-compress
• [x] https://www.shadertoy.com/user/bjornornorn
• [ ] https://www.itu.int/pub/R-REP-BT.2407
• [ ] https://drafts.csswg.org/css-color-4/#css-gamut-mapping

LC projections:

• CIE-Lab
• OK Lab
• ICtCp
• Jzazbz

LC mapping:

• https://trev16.hatenablog.com/entry/2020/06/07/094646
• https://bottosson.github.io/posts/gamutclipping/
• https://www.desmos.com/calculator/g3gyndyme9
• https://colab.research.google.com/drive/1rYFDmHuv0MNzCHXQSwhBkJaMbTQzoXl3