Render surface with edges by drawing the edges while
drawing the surface. This solves issues related to the depth
buffer. Previously we would draw edges with lines but because
lines are rasterized different than triangles the zbuffer values
could be significantly different resulting in situations where
the lines were dashed or poking through. By drawing the edges
as part of the surface this issue goes away.

Additoinal benefits. SInce we are drawing the edges as part
of the surface, the boundary between the edge and the interior
of the surface can be antialized in the fragment shader
almost for free. Resulting in very clean interior edges.

Downsides. Where the surface ends the line will not be the
full width as it has only one side of the edge to draw on.
We expand the triangle a bit to help with this but it will
not fully solve the problem.

Additional downside is that when drawing quads or higher order
polygons opengl requires we submit as triangles. That means
interior edges have to not be drawn. We handle that, but it
can result in render artifacts where an interior edge of a
quad covers fragments of where a thick edge should be from
another triangle.

In usage surface with edges will look best with
widths between 2 and 5. To be fair the old approach also had
artifacts with really large lines due to how it handled corners
but it was not quite as bad.

Issues with overlapping convex polygons required removing
edges from the cutter tests. Basically when triangulating
convex polygons the renderer just uses a simple algorithm
which results in overlap which can overlap the edges.