more accessible and direct workflow for integrating render and backplate photo

at the moment the workflow to match the photo, project it onto basic geometry, setup shadow catchers and compose it in VfB is possible but inconvenient. This is a fairly common scenario in archviz. There are a lot of small things that could be more helpful along the way: uvw projection from cameras, Wrapper setup for typical cases, simple way of color correction of layers in VfB, overlaying alpha masked images in VfB...