Choose more helpful name for shaders

[alanszlosek]

Perhaps projectionViewPosition (which is meant to hint at the matrix math going on inside it) should simply be called nonScene to imply that it should be used to players as opposed to voxels. And projectionPosition might simply be called scene to imply it should be used to draw the scene/voxels, as opposed to players, the sun, etc. But first need to verify usage of those shaders.