Mgheata/polyhedron rev1

The solid passes now the ShapeTester in the most complex configuration (rmin, rmax and phi cut, degenerated Z segment). The bug fixes have an important impact on the performance (specially on Safety for phi cuts, less on Distances) . This is fully documented in VECGEOM-242 (a file is attached). The clang-format is not done. What remains to be done for this solid - unit test, more topologies in ShapeTester and possibly further improvements can be done in a different branch after this merge.