fix context setup

change order: first set context traits, than context state attributes
Match osg terrain ids with physx material ids, shift using geometry shader

not fully working, terrain id 0 means mateial e_hole, hole in the terrain, but spheres do not fall.
Change row/column iteration: when setting osg data rows, use physx data columns (max-1 .. 0), so the base transform gets more logical now.