Use external colorlib

This is a work in progress branch.

Goals of this refactoring:
- [x] Get rid of all the internal color libraries
- [x] Keep the CSS as untouched as possible, keep it useful
- [x] Keep the line and column numbers for useful feedback
- [ ] Make the rendering of each color in the command line output recognizeable by showing both the matched color and the hex color (optional)
- [ ] Improve the rendering of each color with filename, line number, column number (optional)
- [ ] Make sure nothing is broken
I made the css-color-names maintainer add `rebeccapurple`, does pipettuer have it yet?