x3d output updates and setuptools fix

See merge request !456

  the extention to surfaces (-2) or volumes (-3)
- new "Extend" mesh size field allowing to extend (using a power law) the
  boundary mesh sizes inside surfaces or volumes according to the distance to
  the boundary

Make explicit that scripts is empty. Verified to build and install python package using python 3.8 and setuptools 58.0.4, and using python 3.10 and setuptools 60.1.0

for INP export a negative value of saveGroupsOfElements can now be used to prevent saving elements of dimension dim, if the (dim+1)^th least significant digit of -saveGroupsOfElements is equal to 0. This is useful to be able to e.g. only
have 3D elements in the output file, but node sets identified by physical surfaces or curves. Cf. #1664.

Updates to writeX3D in suface mode = 2. Will now include color of face as Material property. Update to setuptools.setup to work with python 3.10. Scripts argument requires a python script as in interpreted as utf-8 encoded object not binary object. zip_false needed to avoid bad_marshal error

code reorganization

See merge request !455

tutorial/ -> tutorials/

always call ShapeFix_Wire.FixReorder() in OCCFace setup: while for non-periodic surfaces GEdgeLoop would correct it, for periodic surfaces the location of degenerate edges linking 2 sides of the parametric space is crucial and cannot be deternined by GEdgeLoop

refine last patch: save node sets in INP format for all entities if digit in -Mesh.SaveGroupsOfNodes == 2, whether physical groups are present or not (cf. #1664)