Calling pause while track is loading has no effect.

[curiousdustin]

Describe the bug
If pause() is called while the next track is loading, the track still plays after it has loaded.

Expected behavior
The track would not play once it has loaded. Instead it would be paused at the beginning.

Desktop (please complete the following information):

• Version 0.11.2

Additional context
I believe this is because of the _playWhenReady flag. If I add the following in AVPlayerWrapper, the issue is resolved.

func pause() {
    _playWhenReady = false
    avPlayer.pause()
}