Correctly transform OpenCOVER lights
Correctly transform OpenCOVER lights

Lights that reside above OpenCOVER's objects-root in the scene graph need to be transformed to object coordinates

szellmann/visionaray,szellmann/visionaray,tu500/visionaray,ukoeln-vis/ctpperf,tu500/visionaray,ukoeln-vis/ctpperf