sub-playlists/playlists inside playlists

[phly95]

• I carefully read the contribution guidelines and agree to them.
• I checked if the issue/feature exists in the latest version.

I often like finding albums in playlist form, but if I want to add it to my albums playlist, it becomes problematic since it's a bunch of individual videos. It would be awesome if you could place playlists inside playlists, and when queued you can skip to the next song or the next album.

[stale]

This issue has been automatically marked as stale because it has not had recent activity. It will be closed if no further activity occurs. Thank you for your contributions.

[Stypox]

Duplicate of #1313