[Gzz] Libvob is now functional

[Tuomas Lukka]

Libvob now passes both OpenGL and AWT tests.

There is still a lot of missing functionality: lots
of transformations missing, lots of vobs missing &c.

However, one important thing is that we're not going to add
all transformations that we had in Gzz into libvob: since
libvob is now extensible, some of them belong in Fenfire
(specifically, buoy and nadir).

The same goes for vobs.

I'm currently exhausted after this port and would strongly
appreciate seeing some activity (take initiative!) and 
questions around the new architecture.

        Tuomas