Improve help command

[weeco]

Currently the help command doesn't return a list of all available commands.

I am not sure if this is by design or a bug with the windows powershell, hence I attach this screenshot:

[thomrick]

Never tested with windows powershell in fact so thanks for your feedbacks @weeco :-)
I'll check that to improve display on windows powershell.
You can use the docker image if you want a full cli experience 'till this will be fixed ;-)

[thomrick]

Same as #103