Enter HEX color codes in scheme editor

Hi,

it would be great if we could enter a specific HEX code in the color picker of the map scheme editor. I know that it's possible to just enter the HEX codes in the album.style file, but it would be easier to find the part I want to edit in the app's included scheme editor, and it would be more convenient.

Since the colors are stored as HEX codes in said file anyway, I assume it wouldn't be too hard to include as a feature.

Thanks