[Feature] Add subscene to `subselect`

[WhoMI7]

If it is possible. This script supports subscene: https://github.com/yassin-l/submpv Maybe this can be used as a reference.

[RaXorX]

I just came into knowledge of subscene as per someone's suggestion, but sadly subscene is going to shut down its services soon. https://www.reddit.com/r/DataHoarder/comments/1ayu97p/subscenecom_is_about_to_shutdown_soon/