libsigc++: New API in libsigc++ 2.12

libsigc++ 2.12.2

New API in libsigc++ 2.12

Member sigc::track_object (const T_functor & _A_func, const T_obj1 & _A_obj1)
Member sigc::track_object (const T_functor & _A_func, const T_obj1 & _A_obj1, const T_obj2 & _A_obj2)
Member sigc::track_object (const T_functor & _A_func, const T_obj1 & _A_obj1, const T_obj2 & _A_obj2, const T_obj3 & _A_obj3)
Member sigc::track_object (const T_functor & _A_func, const T_obj1 & _A_obj1, const T_obj2 & _A_obj2, const T_obj3 & _A_obj3, const T_obj4 & _A_obj4)
Member sigc::track_object (const T_functor & _A_func, const T_obj1 & _A_obj1, const T_obj2 & _A_obj2, const T_obj3 & _A_obj3, const T_obj4 & _A_obj4, const T_obj5 & _A_obj5)
Member sigc::track_object (const T_functor & _A_func, const T_obj1 & _A_obj1, const T_obj2 & _A_obj2, const T_obj3 & _A_obj3, const T_obj4 & _A_obj4, const T_obj5 & _A_obj5, const T_obj6 & _A_obj6)
Member sigc::track_object (const T_functor & _A_func, const T_obj1 & _A_obj1, const T_obj2 & _A_obj2, const T_obj3 & _A_obj3, const T_obj4 & _A_obj4, const T_obj5 & _A_obj5, const T_obj6 & _A_obj6, const T_obj7 & _A_obj7)