Avoid warning with g++ -Wcast-qual by using const_cast to make world group object pointers writable.
Avoid warning with g++ -Wcast-qual by using const_cast to make world group object pointers writable.


kongr45gpen/bzflag-import-1,kongr45gpen/bzflag-import-1,kongr45gpen/bzflag-import-1,kongr45gpen/bzflag-import-1,kongr45gpen/bzflag-import-1,kongr45gpen/bzflag-import-1