Copy image effects/components to each VRSurface camera.

[DuFF14]

Currently, the camera component on DisplayController.cs (VRDisplayTracked prefab) is coped to each VRSurface camera. This should be extended to copy any other effects/components that should be attached to each eye.

[DuFF14]

Continuing discussion from #101...

Perhaps adding one VREye and VRSurface to the prefab hierarchy (make VREye a sibling of VRViewer, with a VRSurface child) could work as a solution. This would work for cases with one eye and one surface, and any additional eyes can be duplicates of the original.

[DuFF14]

Here is what I meant with the previous comment: #111
Seems to be working, but I haven't tested it in a game with image effects yet.
@ImperialPenguin do you think this could work?

[DuFF14]

Fixed by #111