VDG suggestions and wishes about the system tray

[David Edmundson]

>
> For this case, to allow to configure this basic functionality we came up
> with greying them out if the plasmoid is not configured to show
> non-removable devices. This way it's clear that it currently does not hold
> any information, however the configuration dialogue is still available.

The icons are monochrome already? You can't grey them out further