Use API for play\pause media state instead of volume detection

[AmadeusW]

I dug around Windows.Media namespace to see whether we can detect the play\pause state in Windows 10, as indicated by the play\pause button.

I couldn't find a solution. It looks like the play\pause state is available to individual playback devices, but we have no access to other's playback devices. I decided to fall back to measuring volume on the sound card using legacy APIs.
If you know how to access the global play\pause state in Windows 10, let us know!