automatically toggle between docked and undocked mode
This is mostly to
- help testing convergence without having to fiddle with gsettings
- exploring how ui should look like
- give as enough leverage for Apps_Issues#159
See https://social.librem.one/@agx/105000536376844564
TODO
- better docked detection (currently we just count screens)
- figure out if this should stay in the shell or in a g-s-d plugin (lets keep it in the shell atm)
- a nice icon to indicate 'docked' mode (maybe @tobias.bernard has an idea)
This is what gets changed in docked mode:
- windows become floating
- gtk is toggled out of phone mode
- osk gets hidden
- headerbar switches to default layout
- icon is put into the status bar to indicate docked mode
Closes: #366 (closed)