Allow configuring retention period for sleep noise recordings

From Anonymous on 2015/10/04 08:53:01 +0000

I usually only listen to the sleep noise recordings within the first day or two, and my storage space is rather limited. It would be helpful if I could reduce the number of days that they are retained for.

Copied from original feature request: http://urbandroid.uservoice.com/forums/264867-sleep-as-android/suggestions/10055538-allow-configuring-retention-period-for-sleep-noise