Environ Mapping support on RT GPU

[Xiaobola]

I have to use Screen Environ Mapping on bitmap for some projects.
Would be nice to have this feature working in RT GPU.

Thanks

[svetlozar.draganov]

According to our system this feature has been implemented during the 3.x beta stage but it doesn't work right now.
I'll make a note about it.

Edit: Actually it works for environment bitmaps but not for geometries - I'll make a new feature request about that.