[REQUEST] Music queue

[liana-p]

Is your feature request related to a problem? Please describe.
We want the ability to queue a "playlist" of music instead of playing only one, as there is no way for narrat scripts to know when a music ends.

Describe the solution you'd like
Would need some refactoring in the audio store to make the AudioChannel type also keep a queue of the next audio files to play. Then when an audio stops playing, if something is in the queue, it should be popped and played.

For the purposes of queuing, looping should probably be ignored. We will need a way to loop the whole playlist though, which would involve keeping track of what was originally in the queue.

Additional context
Requested on Discord