More audio control

[Dash-L]

I realize that audio is at a very early stage in bevy, and that @cart has said he isn’t necessarily going to address it yet, however, I feel like there should at least be the option to play audio at different volumes, and ideally, more fine-grained control such as more features of rodio like playing anything that implements the rodio::source::Source trait

[ghost]

I think there should be play/pause/resume and the ability to get an audio track's playing position too. I've been thinking about building a rhythm game using Bevy and those features would be very useful.

[mockersf]

play/pause/resume/volume are now available https://docs.rs/bevy/latest/bevy/audio/struct.AudioSink.html