Added code for creating external collision skin also in case of meshes made with ChElementHexa_8 bricks.
Added code for creating external collision skin also in case of meshes made with ChElementHexa_8 bricks.

dariomangoni/chrono,amelmquist/chrono,projectchrono/chrono,andrewseidl/chrono,rserban/chrono,tjolsen/chrono,rserban/chrono,projectchrono/chrono,jcmadsen/chrono,rserban/chrono,armanpazouki/chrono,tjolsen/chrono,amelmquist/chrono,andrewseidl/chrono,andrewseidl/chrono,dariomangoni/chrono,tjolsen/chrono,armanpazouki/chrono,rserban/chrono,tjolsen/chrono,jcmadsen/chrono,dariomangoni/chrono,projectchrono/chrono,amelmquist/chrono,projectchrono/chrono,projectchrono/chrono,dariomangoni/chrono,tjolsen/chrono,amelmquist/chrono,amelmquist/chrono,Milad-Rakhsha/chrono,rserban/chrono,Milad-Rakhsha/chrono,amelmquist/chrono,dariomangoni/chrono,rserban/chrono,armanpazouki/chrono,andrewseidl/chrono,armanpazouki/chrono,armanpazouki/chrono,jcmadsen/chrono,Milad-Rakhsha/chrono,jcmadsen/chrono,Milad-Rakhsha/chrono,Milad-Rakhsha/chrono,jcmadsen/chrono,dariomangoni/chrono,armanpazouki/chrono,rserban/chrono,andrewseidl/chrono,jcmadsen/chrono,jcmadsen/chrono,Milad-Rakhsha/chrono,projectchrono/chrono