[FEATURE REQUEST] Dolby Vision support for MKV [IMPLEMENTED]

[HelloYou]

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[implemented] UPDATE to latest Exoplayer (android/firetv) --Listen to your customers--

PLEASE update android/firetv apps to latest exoplayer! Many issues including subtitles would be resolved and comes with many core improvements. Last core update was a long time ago. Same complaints keep coming up which are all resolved by latest exoplayer versions or switching to something much better eg MXPlayer, MPV, BSPlayer, VLC.