Some feature proposals

[invrtd-h]

Hello. I've thought of a few features that would be nice to have in climate. Are you interested in these?

1. Add a new builtin command ‘--version’ (The current ‘version’ argument is only used when generating manpages)

2. Add tty-interactive output capability. Currently, if I try to output help messages to a non-terminal destination, the ANSI escape codes are printed verbatim. We need functionality to detect if the output destination is a terminal and output plain text otherwise. (I tried implementing this once, but I'm unsure whether to store the tty-interactive option in Help_style.t or elsewhere...)

3. Add functionality to manage a short summary and a long description separately, similar to Rust's clap crate. The short summary is output via the ‘-h’ option, and the long description via the ‘--help’ option.

[gridbugs]

Hey thanks for the suggestions. I'm not sure yet whether I'd want 1 or 3, but 2 certainly sounds helpful. If you want to have a go at implementing it that would be great!