Argparse Dependency

[mitsuhiko]

This crate is currently very heavy in dependencies, and at least argparse seem unrelated to the crate. Maybe the CLI could be moved to a separate crate to remove that dependency or behind a feature flag.

[rlidwka]

Maybe the CLI could be moved to a separate crate to remove that dependency or behind a feature flag.

Probably a separate crate. Everything is in one crate currently, and that probably needs to change at some point. Any suggestions about crate names?