Nico Weber b2a1130556 LibGfx/ICC: Implement conversion between different connection spaces ...

If one profile uses PCSXYZ and the other PCSLAB as connection space,
we now do the necessary XYZ/LAB conversion.

With this and the previous commits, we can now convert from profiles
that use PCSLAB with mAB, such as stress.jpeg from
https://littlecms.com/blog/2020/09/09/browser-check/ :

    % Build/lagom/icc --name sRGB --reencode-to serenity-sRGB.icc
    % Build/lagom/bin/image -o out.png \
        --convert-to-color-profile serenity-sRGB.icc \
        ~/src/jpegfiles/stress.jpeg

2023-12-04 08:02:36 +00:00

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