connman: new packages ConnMan v1.20 and connman-ui

connman: connection manager, lets say its a replacement for NetworkManager, it comes with dbus and command line interfaces
connman-ui: tray icon and its menu, its a bit buggy, I am running it in supervisor...

I have been using ConnMan on NixOS for half a year now, and is quite reliable, well .. in that time I did not have to restart any network related services, and yes it has its problems like connecting to eduroam (not tested with this version), and for VPN you have to write own config (which is quite easy to do)

also added myself to maintainers