Maintenance scripts that are not shipped as part of the package.

Regenerates the 256-colour table in progressbar/terminal/colors.py, deriving every HSL value from its RGB via HSL.from_rgb (the RGB, xterm index, colour name and Python binding name are authoritative and left untouched). Run it in place:

python tools/generate_colors.py progressbar/terminal/colors.py

It is idempotent; --check verifies the committed file is up to date without writing.