v1.2.0

Upgrade clap v3 → v4

The upgrade to clap v4 has mostly only changed the help texts (specifically the ones that you get from passing either the -h or --help flags). These now look quite a bit different, although the content is substantially identical. There’s no more coloration, and help texts should now only wrap at your terminal’s width, which might be difficult to read if your terminal is many characters wide. In any case, this required adding the "wrap_help" feature to clap. Other features were also added, but they are not new; they were just not previously optional.