[osg-submissions] Fullscreen enhancement to osgviewerCocoa

[E. Wing]

I've been sitting on this simple enhancement for quite awhile. Now
that the NDA is lifted, I can finally submit it.

For osgviewerCocoa, a very simple change to allow toggling between
fullscreen mode and back between views. (To activate, double click on
the view to toggle.) It demonstrates/uses the new one-liner fullscreen
method introduced in Leopard. Code will still compile and run in
pre-Leopard (thanks to Obj-C dynamic/late binding), but code path is
treated as a no-op in those cases.

Thanks,
Eric
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