Change description of a device like "null output"

[schuellerf]

When creating two "Null output" devices, they have the same description and can't be distinguished in other applications
(like default volume control or the applications using them)

It would be perfect to be able to change the description of a device.

---- Ideas/Remarks
Either right-click and change the description in a dialog box, or a more sustainable approach with a panel to more generically change any (changeable) property
(Maybe I'll also try to implement and provide a pull request)