adding Implicit MR support

- changed all polyhedron to tiling square
- renamed primitives3d to kick out
IHM2 :
- renamed Algo/IHM/ihm.h/hpp to kick out (use Topology/ihmap/ihm2.h instead)
- add ihm2_PrimalRegular object wich is similar implicit equivalent to map2MR_PrimalRegular

Cubic tiling ok

square tiling -> ok

Deleting old tet import files

[CGoGN] begin adding tetgen for tetrahedral mesh generation
[SCHNApps] add volume import plugin
[SCHNApps] add volume render plugin