Switch to cobra for argument parsing + shell completions

[pomdtr]

Beeing able to have completion for --session flags is quite nice.

See the kks completion command for setup instructions.

[kkga]

woah, this is a big PR. Thanks for the contribution! TBH, I'm not quite sure that something like completions for --session deserves an integration of cobra. The original approach was simple and worked fine without adding any extra dependencies.
Are there any other obvious benefits aside from the completions?
Also worth noting that I'm not actively using Kakoune these days and thus not using this tool as well.

[pomdtr]

Basically all the doc is now autogenerated, and you get completions for everything (not just the session, also the command names / flags).

If you are no longer using kakoune, I could maybe maintain my fork instead ?
I feel like this cli (or connect.kak / kakoune.cr) is a core component of the kakoune experience (akin to kak-lsp), so I really want a maintained version of it to exists / be universally available.

[pomdtr]

I personally mostly used vscode with the dance extension, but I'm still reaching for kakoune on a daily basis.