Andy's virtual-panel support. This will give a first taste of flying
with a 3D cockpit, but there are many caveats:
1. Clicking on the instruments doesn't work (waiting for a fix from
Andy).
2. The instruments rotate with the 3D cockpit but they don't tilt with
it (also waiting for a fix from Andy).
3. The orientation is incorrect when the view is not straight-forwards
and the plane is not flying level (waiting for a fix from me, but I
don't understand matrix math well enough).
4. The 3D interior is fairly ugly right now.
