* Curves have been split into 2D and 3D variants.
* Curve and surface domains have been removed.
* Edges now have an interval for its curve parameter.
* The 'xbasis' and 'normal' parameters have been replaced
  with 'xAxis' and 'yAxis' parameters.
* Line curves have been reduced to a single form, that is,
  an origin and a normalised direction.
* Weights in NURBS curves and surfaces are now independent
  from the control points. This allows B-splines curves and
  surfaces to be defined as a NURBS curve or surface without
  the weights array.
* The definition of cylindrical, spherical, and toroidal
  surfaces have been simplified. All of the parameters are
  now contained within a single JSON object.