log an error when a polygon exceeds maxPolygonVertices

[clankill3r]

I had incomplete shapes:

After some digging I came to this fix: testbed.maxPolygonVertices = 48; // default is 12

It would be nice when creating a Polygon, e.g.

body.createFixture(pl.Polygon(vecs), 2.0);

That a issue is logged to the console if vecs.size > maxPolygonVertices.