Atomic-cli tab autocompletion using clap_generate

[joepio]

Depends on https://github.com/clap-rs/clap/issues/1232

[jonassmedegaard]

Crate is nowadays called clap_complete, is packaged for Debiaa, and a dependency of a range of other crates and projects.

Are you sure the referenced issue is a blocker for using it? Seems to me it is about implementing an improved shell parser - which to me smells like an improvement but not a blocker (TAB-completion that handles only some patterns - e.g. only file paths but not lookup of atomic data object names - would still be helpful as you could then simply type manually where no suggestions are offered).