Render Layers Node for The Sequencer Compositor

The sequencer compositor does not support the Render Layers node. But this node could be very useful in combination with the image coordinates node for example, which would result in a UV map covering the whole screen. This UV map can later be used for many effects. I also suggest that it not transform using the strip's transform settings, so the UV map continues to cover the whole screen regardless of the strip's transformation; also, if needed, those transformations can later be applied using the available nodes.

Currently the only alternative is to use a blank image node, but it has the major disadvantage of not having its size change with the scene resolution.