🚀 Feature: Cycle through multiple front covers

[aw-was-here]

🔖 Feature description

Some audio files have more than one cover art embedded. It would be neat to cycle through them. See also #348

🎤 Pitch

Variety of content.

✌️ Solution

Add new keywords for the websocket to rotate through, just like we do for other art.

🔄️ Alternative

None.