Add Gamut Comparison app

[jamesnw]

This provides a tool for comparing the gamut mapping algorithms.

It also adds rec2020 variations of the Edge Seeker, Raytrace, and Björn GMAs. These are in the Playground, but not the gradient tool.

https://deploy-preview-22--color-apps.netlify.app/gamut-mapping/compare/

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[svgeesus]

These are in the Playground, but not the gradient tool.

Not a blocker but it would be good to have those in the gradient tool as well. It is useful both for timing and also to compare small visual differences.

[jamesnw]

These are in the Playground, but not the gradient tool.

Not a blocker but it would be good to have those in the gradient tool as well. It is useful both for timing and also to compare small visual differences.

I added these to the Gradient tool, and added the ability to select which algorithms to include. By default, the enabled algorithms are ["clip", "css-rec2020", "raytraceRec2020", "bjornRec2020", "edge-seeker-rec2020", "chromium"], but this can be adjusted if a different set is preferred.

[facelessuser]

For the parts I'm interested in, this seems good.