Porting xfdesktop to Gtk3

[Florian Weigelt]

Please find attached my initial work on porting xfdesktop to Gtk3. I
cannot test with a multi monitor setup here, so this would be something
anybody interested in helping could look into.
xfdesktop's Gtk3 version only runs when compiled with --disable-thunarx,
because thunarx pulls in Gtk2 symbols.
Also, I only worked with -Wno-deprecated-declarations, fixing those
warnings is work for later.

Kind regards
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