VG3_sprite_clone()Clone an animated sprite (copy).
Returns a pointer to the cloned sprite (copy) or NULL on failure.
On error VG3_errmsg() returns: EINVAL - error in argument ENOSPC - too many audio files loaded ENOMEM - cannot get memory ENXIO - error loading audio file ENOEXEC - error decoding audio file
Clone an animated sprite as a copy and return pointer to it. The cloned sprite will be rewinded.