Add new app to play audio files, and consider removing Music
Moving this from #148 (comment 890192). Design team previously proposed, and release team previously approved, moving Music and Photos to a new subcategory of core that isn't installed by default. But we got cold feet and decided to delay a release cycle before changing anything.
This is a sub-issue of #150 (moved), reconsidering all core apps.
Edited by Michael Catanzaro