[WIP] Update ExoPlayer to version 2.8.2

Feat/ontimedmetadata android

Update NewtonSoft JSON to match react-native-windows version

Android - Keep screen on

Expose DefaultLoadControl parameters Android ExoPlayer

I'm guessing this was a bug as it doesn't make sense that we would set paused to true if the video is playing, and not paused if it wasn't. I believe this is a safe change since we only release the player when the app is closing or we detach (which is going away shortly). We need this since we release the player in order to apply new bufferConfig settings.

Fix for #1150 and improvements for #1143

remove tracks that are not valid from textTracks; and default to system if selectedTextTrack unavailable

Fix sideload text track issues on iOS

Just calling react-native link is risky, it can cause double linking

# Conflicts:
#	android/src/main/java/com/brentvatne/react/ReactVideoView.java