Generalize all possible nodes to work on group data

[Keavon]

Most nodes are rather limited in their type signature compatibility. Most nodes only work on VectorData, but should be extended to work on GraphicGroup data as well. #1822 covers the Path node case.

A good first step is evaluating what nodes are missing support and which make sense to support this, and find a plan to cleanly integrate this change across all those which need it.