All classes were reviewed apart from VisualServer for which no argument name is documented at all.
While doing this review, I found quite a few bugs that were fixed either in earlier commits or this one (mostly documentation bugs though, i.e. some arguments were listed at the wrong place).
-Visible 2D and 3D Shapes, Polygons, Tile collisions, etc.
-Visible Navmesh and Navpoly
-Visible collision contacts for 2D and 3D as a red point
-Customizable colors in project settings
Works for 2D and 3D
These are still just helpers in case you want to animate them or access them
directly.
Modifying the real shapes is still done via CollisionObject and CollisionObject2D APIs
But an API was added so you can query which shapes from CollisionObject correspond to which CollisionShape.
Have Fun!