Completely refactor PlaybackBarLayout into PlaybackLayout, which now
not only handles the bar behavior but also allows for one to slide
up the bar layout into the full playback layout. This was largely
adapted from umano's AndroidSlidingUpPanel, albeit heavily minified
and mixed with the previous window inset tricks of the previous layout.
There are still some tweaks to be made, but this implementation seems
to be really good.
Change CompactPlaybackFragment into a View. This completely fixes the
issue I tried to band-aid in ae39054. The code is a bit uglier, but
that's tolerable.
Make HomeFragment's AppBarLayout lift when the data scrolls. This
was something I wanted to do initially, but kept running into issues
with. Turns out the addition of my custom AppBarLayout made this pretty
trivial all things considered. The entire app now follows this idiom.
