Mania key color customization for argon

[gmkt]

Please, add a way to customize key colors in argon skin 4k-10k.

For me as one of the rare argon skin mania players, it's annoying to switch between different key counts, because of the inconsistent coloring. I wish there was an option to change colors. Obviously everyone uses their own finger-to-key layouts, so imo it would work best as a skin customization option.

Something like a json file that I could change and then reimport would be perfect.

Examples (like think of switching from 7k to 6k, or 7k to 8k, etc.)

6k	7k

8k	10k