This should get the "right_edge" value for each segment plumbed through to the binning phase. It also needs to be plumbed to coarse raster and wired up there. Also considering WIP because none of this logic has been tested yet.
Working down the pipeline. WIP
Iterate over bin bounding box. Seems to work, and is a dramatic improvement.
Adds a binning stage. This is a first draft, and a number of loose ends exist.