Debugger page should have varying shapes & sizes #423
Description
To better visually test the renderer every time the debug page is used:
- Display every node shape
- Display every edge arrow shape
- Display varying node sizes
This will allow for better coverage of the types of drawing that the renderer can make. It seems that the renderer has/had several bugs, and this will help to elicit them better and make sure that we don't introduce more of them in future.