Switch auxio to a single-queue system. "Play next" adds songs to the top
of the queue, similar to before, and then "Add to queue" adds songs to
the bottom of the queue. This enables many more enhancements to be made
to the playback experience, at the cost of a feature I preferred.
Resolves#44.
Update the image behavior for the following:
1. Use ic_album as the default image for songs and albums this just
looks beter in general.
2. Use a special default drawable for the widget so that it doesn't
look as strange.
3. Generally update the loading process throughout the app
Refactor styles again, this time trying to seperate the more
layout-specific attributes so that layouts become more re-usable.
This also updates the naming conventions of styles.
