- https://en.wikipedia.org/wiki/ANSI_escape_code#Colors
- https://gist.github.com/chrisopedia/8754917
- https://gist.github.com/XVilka/8346728
- https://no-color.org/
- http://mkweb.bcgsc.ca/colorblind/
- http://www.calmar.ws/vim/256-xterm-24bit-rgb-color-chart.html
- http://safecolours.rigdenage.com/palettefiles.html