Feature/februrary changes 4 (#279)
* Fixed lint issues
* Fixed subtitles setup issue
* Fixed unregister listener issue in iOS.
* Fixed unregister listener issue in iOS.
* Updated examples
* Updated documentation
* Updated documentation
* Fixed HLS audio tracks playlist selection issue.
* Added enableProgressBarDrag in BetterPlayerControlsConfiguration
* Added enableProgressBarDrag in BetterPlayerControlsConfiguration
* Fixed audio track selection in ExoPlayer
* Better Player 0.0.52
* Updated loading color
Co-authored-by: jhomlala <j.homlala@gmail.com>