Add track selection (iOS, Android) and useTextureView prop for ExoPlayer

[asdmikk]

This adds the ability to select media tracks during video playback. It is achieved by adding a new overrideTrack static method. It works for both iOS and Android (ExoPlayer).
A useTextureView prop has also been added to enable smooth transforming of the

[acollazomayer]

@asdmikk This is a great feature, can you give me an example on how to use it. Thanks!

[cobarx]

@asdmikk Thanks for submitting this! I've gone ahead and copied your work for useTextureView into #1049 so that I can merge it without bringing in the track selection.

For track selection, I want to make the props a bit simpler and easier to use so you don't have to know the index & renderer numbers. I've already developed a prop for text tracks and will be working on audio tracks soon.

[stale]

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