added type traits to support the mod below:
[ Changes in definition of TriMesh: PART II ]
Note: No changes to existing code need be the done, this mod
should be fully backward compatible
Old way to define a TriMesh ==============
struct MyMesh: public vcg::tri::TriMesh< vector<MyVertex> , vector <MyFace> >{};
new ways to define a TriMesh ==============
struct MyMesh: public vcg::tri::TriMesh< CONT1 >{};
struct MyMesh: public vcg::tri::TriMesh< CONT1 , CONT2>{};
struct MyMesh: public vcg::tri::TriMesh< CONT1 , CONT2, CONT3>{};
where CONT[i] can be vector< [MyVertex | MyEdge | MyFace ] >
(the order is unimportant)
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