Polygon geometricallyEquals shouldn't care about vertex ordering

[Robert Griffin]

If you call geometricallyEquals on a convex polygon, it shouldn't care about the ordering of the vertices, as that doesn't influence geometrically if the two polygons are equivalent.

[Sylvain]

1. Let's make sure this issue is covered in unit tests. @Richiedu38 look into ConvexPolygon2DTest.