Experiments in porting exo to Gtk3

[Jonas Kümmerlin]

Over the last two days, I tried to port some code of exo to Gtk3, just
to see what it would take, and figured maybe you guys could use some of
it for the 4.14 development (see attached patch).

Now working with Gtk3 are ExoIconView, ExoIconChooserDialog and the
exo-helper, exo-open and exo-desktop-item-edit utilities.

Code is still rough at some edges (grep for TODO and FIXME), riddled
with #if, but compiles and appears to be working.

Regards,
Jonas
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