Modify the music loader to use the normal artist name when using song
titles while still retaining album artist functionality.
Oftentimes music files will be tagged as to use the artist tag to
specify performers, collaborators, and others, and then use the album
artist tag to group them up into a single artist. Previously, Auxio
would only use the album artist tag, which flattened the collaborator
information out for consistency. Resolve this by implementing a sort
of "resolved artist name" for songs that is used in the UI and nowhere
else. This seems to work well, but at the same time further ruins the
API surface for handling music objects. An acceptable price to pay
for a better UX.
Add a new layout that handles the edge-case where splitscreen is used
on a sufficently small device. Previously it would result in a squashed
landscape layout, but now it will show a layout that should fit fine in
most situations.
