Greyson Parrelli 3f25fb7d5f Handle voice note media playback with ExoPlayer.
There are several (popular) phone models out there that have bugs in
their MediaPlayer implementation that cause them to be unable to play
voice notes. By moving to ExoPlayer, an application-level media player,
we should avoid most of these headaches and stardardize playback.

Fixes #7748
2018-11-19 11:36:08 -08:00
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