No way to resume an interrupted track without touching internals

[atesgoral]

After interrupt() is called on WavStreamPlayer, there's no way through the external API to resume the track.

Need to reach into the interruptedTrackIds property to set the relevant track's status to false before calling add16BitPCM:

wavStreamPlayer.interruptedTrackIds['some-track'] = false;
wavStreamPlayer.add16BitPCM(audioChunk, 'some-track');

Maybe a resume() method is needed for symmetry?