Add support for the Budgie Desktop
Submitted by Ikey Doherty
Assigned to Allison Lortie
The Budgie desktop has existed since 2013 and is in wide spread usage, as indicated in Solus, Ubuntu Budgie, as well as presence within the Debian and Arch repositories.
Currently the Budgie desktop may identify itself as either "GNOME:Budgie" or "Budgie", given the current use of gnome-session.