Add optional coloring for output highlighting

I think it could be nice to have some an option (or default) for colored output (and other font styles).
Many programs have --color <when>.

It could be helpful in making the output better to read and notice important details.
It should not be anything fancy and defensively not forced or too much.

Maybe errors in red, warnings yellow/orange, notes in blue and some things bold.

(See pacman output with colors for reference ↑)

It could be implemented with something simple as ANSI escape sequences if they are cross compatible enough. https://stackoverflow.com/a/287944