Import .aco palettes using Babl rather than GimpCMYK/HSV
As mentioned in !843 (merged), currently the Adobe .aco palette import code uses GimpCMYK and GimpHSV for conversions to RGB.
This patch ports these conversions to use Babl instead. This is a precursor to further improvements to palettes as part of the Color Space Invasion project. As a side-effect, the Babl conversion allows GIMP to now import CIE Lab color palettes (color space #7)).
Sample Files:
- Lab: lab.aco
- CMYK: cmyk.aco
- RGB: PerfectPalette2020.aco
Edited by Alx Sa