Add subcommand alias to TabComplete

[thelipe7]

When running tabcomplete on a command, the aliases of the subcommands are not returned, only the subcommand itself

[LichtHund]

That is intentional, only tab complete main commands. This is still not final and will likely be improved to only display main commands but if you start typing then slowly add aliases as well.
But again I have no yet decided what is the best way go about it, but it won't be showing aliases together with main commands at first. Unless I create an option to turn it on.

Anyways, I'm rambling at this point, TLDR working as intended for now.