static void world_entity_serialize( world_instance *world, vg_msg *sav ){
for( u32 i=0; i<mdl_arrcount(&world->ent_challenge); i++ ){
static void world_entity_serialize( world_instance *world, vg_msg *sav ){
for( u32 i=0; i<mdl_arrcount(&world->ent_challenge); i++ ){