Unit vector command for 3D

git-svn-id: http://dev.geogebra.org/svn/trunk/geogebra@31479 23ce0884-8a58-47d3-bc5c-ddf1cd5b9f9e
Correct orientation for cube/tetrahedron tool

git-svn-id: http://dev.geogebra.org/svn/trunk/geogebra@31480 23ce0884-8a58-47d3-bc5c-ddf1cd5b9f9e