Pass get_seg_masks arg by &
Pass sound vms_vector arg by &
Pass obj_create position vms_vector by &
Pass place_object vms_vector arg by &
Pass object_create_explosion_sub position by &
Pass explode_badass_weapon position by const &
Pass check_effect_blowup vms_vector arg by &
Pass collide_*_and_* arg by &

Use const& where possible.  Some are non-const due to the recent FVI
hack that resets the collision point late.
Remove unused vm_vec_to_angles
Pass extract_*_vector_from_segment arg by &
Mark vm_vector_2_matrix vectors const
Pass laser vectors as const &
Pass phys_apply_* vms_vector by const &
Pass bump_one_object vms_vector by const &
Pass g3_set_view_matrix arg by &
Pass g3_calc_point_depth arg by &
Pass med_create_new_segment arg by &
Pass set_matrix_based_on_side arg by &
Pass create_curve arg by &
Pass vms_vector_swap arg by &