Choose more helpful name for shaders

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.