A Soft Murmur

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* Feature: Allow A Soft Murmur to be moved to external storage

* Bugfix: Fix audio problems in Marshmallow 6.0.1 (6.0.0 is still affected)

* Bugfix: Prevent audio focus listener from interfering with other apps

* Bugfix: Prevent background music service from occasionally persisting when app is killed

* Bugfix: Fix rare circumstances where upgrade is not restored after local data is corrupted or deleted