Pass digi_*_start_sound soundobj as sound_object*
Pass digi_start_sound_object arg by &
Use range_for for SoundObjects
Use array<> for Sounds
Pass automap_find_edge result by &
Return get_side_verts by value
Return vertex_array_list_t from create_all_vertex_lists
Return vertex_array_list_t from create_abs_vertex_lists
Return vertex_array_list_t from create_all_vertnum_lists
Reduce includes in clipper.h
Disallow converting valptridx to void*
Combine shortpos scan loop
Propagate for variable in newdemo
Convert newdemo.cpp to use range_for