Fixes

Well, I took your initial recommendation and ran with it. I implemented some very minimalist and lazy audio focus code for the NotificationService. I think it's pretty good, and I also take into consideration the remote MPD user vs. the local user. Also, fixed the StreamingService focus as well.

With all that said, even though I like my code, if you have a different vision, I'm not amazingly committed to those commits.

With all that said, if you haven't seen the email yet, I also fixed #517. If you don't like the prior commits, feel free to cherry-pick the #517 commit.