Converts a colour to its closest DMC Floss value for embroidery and cross-stitching.
Refer to [this chart](http://yarntree.com/075dmcolors.jpg] and (this chart)[https://www.csh.rit.edu/~vance/pages/color.html)
- some greyscale colours don't match well (eg 30,30,30)
- some secondary colour options don't map well