Completeness of Transform/Transformed method for geometry data types

[luithefirst]

A lot of geometry primitives do not have a Transform or Transformed method:

• Line2d
• Line3d
• Triangle2d
• Triangle3d
• Quad2d
• Quad3d
  ...

In some cases we have a Copy(Func<V3d, V3d> point_copyFun) method. For 3d to 3d transformations, a Transform/Transformed method would be better, but 3d to 2d and 2d to 3d copy methods seem convenient and saves the overhead of an additional copy. It would be interesting to evaluate this.