[virt-tools-list] RFC: drop virt-viewer support for GTK-2 and use GTK-3 features

[Daniel P. Berrange]

Currently the virt-viewer codebase is written to build with both GTK-2
and GTK-3. This was primarily so that we could continue to support use
of virt-viewer on older distros like RHEL-6 which lack GTK-3 support.
GTK-3 has been around for 3 years now and RHEL-7 with GTK-3 support is
not unreasonably far off in the future.

So I'm thinking it could be a good time for us to drop support for
GTK-2, and actually make use of some of the more interesting GTK-3
features we've been holding back on.  In particular I think we should
make use of the application menus in the GNOME shell top bar, and/or
the new GTK design whereby apps have a drop down menu in their window
titlebar. This would let us kill the current menu bar free'ing up more
screen real estate for the guest to use.  IOW update virt-viewer to
look & operate more like a modern GNOME-3 application instead of looking
like an outdated GNOME-2 application

Regards,
Daniel
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