Add UKE color palette

[strengejacke]

WDYT? Must check whether these colors are allowed to be wrapped into a package.

[bwiernik]

Looks fine. The orange and green are very similar to colorblind me

[strengejacke]

Honestly, it's just one of the many palettes out there in the wild, but for teaching/presentations, it's nice to have a corporate design color palette at hand, so it's rather a convenience addition here ;-)
But, the colors look good, it's not a bad color palette, and others maybe also can use them for their purposes.

[strengejacke]

The orange and green are very similar to colorblind me

Do you have problems with specifics plots, are in general with the green and orange color from that palette? Else, we could try to return different default colors for the examples shown above.
I'm not sure if the colors are actually color-blind friendly. Is there a way to check that?

[bwiernik]

I think the examples are fine. It's good that the green and orange are far apart and unlikely to be used together.

This simulator is pretty good https://www.color-blindness.com/coblis-color-blindness-simulator/