Improve typography (again) by isolating my weird non-standard text
styles and moving all font usage to the text styles, which allows
me to eliminate a lot of excessive font usages.
Use Slider and FloatingActionbutton in the playback view. This is not
because I wanted to, but because there were insane bugs on Lollipop
devices that stemmed from them being unable to load complex selector
resources.
Make a dedicated seekbar view so that does the layout magic necessary
to have an adequate touch target while not taking up too much space.
Isolating this makes handling the playback layout's view much easier.
