Blender Git Loki

BGE: removing remaining reference to sce->world->gravity/physics/... (it's all in sce->gm now) + Dome UI changes

UI changes: splitting dome options for different dome modes (eg angle doesn't work for envmap mode)
if anyone wants to tweak that, feel free to do it.

* I put a remaining to bring setEyeSeparation + Focal Length to the Stereo GUI. I'm still not sure what would be the default parameters for that, and that will require other changes (eg remove the flag m_setfocallength and m_seteyesep). For so far only a label remind :)