removed unused functions,
removed unused variables,
reduced dynamic stack memory (there was too much allocated),
moved some code around into better place,
implemented destructor (there is still a std::_face_node left on the stack when the program is done),
problem, apply different model matrices for each model,
solution give a list of all models to ogl controller, where they are handled,
next steps: find solution for wrong rotation + draw ALL models instead of only the first
