JSON protocol for 3rd party apps support

> The CLI docs also don’t mention anything about the menu: parameters or
> window style.
>
> There must be a comprehensive doc for all this somewhere :)

Unfortunately there's none. At least not a comprehensive doc. There's
something int he old wiki, but it's incomplete, and pretty sure not
accurate in all places.

See eg.
https://wiki.slimdevices.com/index.p...owseItems.html