WIP: Make a new ringtone management page
Merge the ringtones and setringtone apps
Checkpoint commit: management UI mostly works
Checkpoint: sharing and managing ringtones pretty much both work now!
Clean up a few minor things
Add support for "None" as an alert tone and refactor adding tones
Fix getting the URL for custom ringtones
Support picking locked ringtones, and validate ringtones before saving them in the ringtone app
Use the snazzy new manage.html page for the pick activity too!