SVG export of 2D molecule depictions

With the latest version of the RDKit and SVG extension nodes it is now possible to export the 2D depictions into SVG files. First, you have to create 2D coordinates (if there aren't already any) and then apply the new "Renderer to SVG" node that uses the RDKit molecule renderer to create SVG cells for each molecule. They can then be written to disk with the SVG writer.