Request: option to make splat less verbose

The progress bars and listing that splat emits when running, are interesting when you run it in an interactive terminal, but in non-interactive environments, just add a lot of noise.

I still expect the warnings and errors to be shown, but I would like the option to run splat in a `--quiet` mode, where a "normal, non-warning/message run" just emits an exit code with no output