Use sudo less globally

Right now we invoke sudo when launching some of the utilities. It would be better if we would raise the privileges only when needed.

Is there a way to do this without
* PolKit, which is considered an [unwelcome technology](https://github.com/helloSystem/hello/wiki/Welcome-and-unwelcome-technologies) due to its roots in the Gtk/Gnome stack
* External helper processes, which make everything more complicated than needed

If not, then external helper processes are probably the way to go...