Support importing Adobe Swatch Exchange palettes
ASE files are used to exchange color palettes between different Adobe software like Photoshop and Illustrator. They are similar to version 2 ACO files (which GIMP already supports) - the main improvements (in addition to being more common now) are using float32 for colors rather than only 16 bits and the ability to mark colors as "spot colors".
The file format specification is described here: https://medium.com/swlh/mastering-adobe-color-file-formats-d29e43fde8eb and http://www.selapa.net/swatches/colors/fileformats.php#adobe_ase
I have functional code for this - I just need to clean it up and submit for review. This issue report is mostly just to log the information.
Edited by Alx Sa