Allow specification of color in metadata upload

[danolson1]

Is your feature request related to a problem? Please describe. I really like the metadata file upload feature. Can you extend it to allow automatically setting colors? Ideally with the XKCD color names (https://xkcd.com/color/rgb/), but RGB tuples or hex color codes would be fine too.

[saifulbkhan]

That is an awesome suggestion! I found a compiled list of colors mapping to their hex values. We can totally do this. Adding it to the next release.