OBJ loader assuming triangles

[cadop]

There is an assumption of triangles, can cause issues later for bvh.

dhart/src/Cpp/objloader/src/objloader.cpp

Line 56 in 26102d0

 num_faces += shapes[s].mesh.indices.size() / 3; 

Need to double check we never get here without converting to triangles

dhart/src/Cpp/objloader/src/meshinfo.cpp

Line 73 in 26102d0

 void IndexRawVertices(