Initial UI messing around
Initial work on live Song name and artist Labels
Don't need to instantiate ViewModel in View
Tweaked the UI
Some refactorings
Added Cycle Repeat Mode button
Implemented initial slider position UI stuff
Song position slider now works (read-only / OneWay)
Add missing metadata check to CurrentSongTitle
Added media key support
Fixed #20 kinda

Turns out playback stopped because the file queued wasn't supported, and
so it stopped rather than complain
Added basic folder picker | fixed #15
Implemented initial ListBox playlist view + fixes

ListBox:
- Works, but is only OneWay for now, TwoWay is coming

Fixes:
- Repeat mode Track stuff, maybe more messy now...
- Setting Playlist._index now only via SetIndex