Add a visual representation of the playlist (e.g. to re-order audios)

Add an alternative version for video posts (might need to end up as it's own fork, might not).

Integrate the soundcloud api, so we finally don't have to skip soundcloud audios anymore.

Probably needs #2 (playlist display) to be done first so that you can actually create a proper playlist to share.

Problems to deal with:

• Opt-out isn't respected
• Opting out of cookies sets an opt out cookie (helpful for checking if explicit opt-out happened, but is a cookie nontheless)
• Scrolling as an identifier that consent was given isn't really ok. Accidental scolls happen and steals the user of their right to choose
• A closing button as an identifier of consent might make many users click it, but i'd personally prefer a clear yes/no response so the user actively has to think if they want to enable cookies
• Links are hard to distinguish from normal text