Gnome Menu integration

Integrate with Gnome so that we have a Gnome VFS library that can recreate the Windows menu heirachy, without having to resort to the wineshelllink hack.

There was some work done on this a while back, but it fell through the cracks.

• I'm 90% sure this won't work with recent versions of GNOME as they no longer use gnome-vfs for the menus --MikeHearn

• We can create a "desktop entry" file (like the ones in /usr/share/applications). A spec for the desktop entry file can be found at: http://standards.freedesktop.org/desktop-entry-spec/latest/

In Gnome 2.16 and recent Wine versions, this works!

See: Ubuntu's Better Integrated Wine Blueprint for the future of how we can index with Gnome.