Sort default palette and fill empty names

Something not consistent with my old palette: the greyscale was
sorted from bright to dark, while the color block were sorted the
other way around: dark to bright. This bug fix it and fill all the
empty "none" names thanks to the page "List of colors" on wikipedia[1]

[1] https://en.wikipedia.org/wiki/List_of_colors:_A%E2%80%93F