Custom sounds for incoming messages are not supported

[Piotr Mitana]

A few OTA's ago the custom ringones were introduce. We need the custom sounds for incoming messages as well - now it is possible to select a custom ringotne, but it is not possible to select custom message sound.

[Launchpad Janitor (janitor)]

Status changed to 'Confirmed' because the bug affects multiple users.

[Pat McGowan (pat-mcgowan)]

The plumbing is all there, I think it was an oversight not to include it?

[Pat McGowan (pat-mcgowan)]

So while its easy to add a Custom message received option similar to ringtone there are a couple issues.
First we need to either enforce a restriction on the size of the audio file, provide a way to truncate it for the user, or limit the playback time for the sound. Otherwise an entire sonata could play on a message.
There is also a bug where we delete all custom sounds from the dir when a new one is selected, so we should either make two subdirs or be smarter if either is in use.