NVIDIA GameWorks Integration

VXGI in UE 4.12:

/tree/VXGI-4.12

Based on 4.12-preview5. The integration is also kind of a preview, it hasn’t been tested enough to call it a release. Everything seems to be working, but there are lots of engine changes from 4.10, so porting it wasn’t straightforward.

No new features compared to the VXGI-4.10 branch, but expect significantly reduced shader compile times.