Feature/february changes 9 (#330)
* Added overflowModalColor and overflowModalTextColor in BetterPlayerControlsConfiguration.
* Disabled picture in picture in fullscreen mode.
* Updated reusable video example
* Fixed enabled parameter for skip back and forward
* Fixed enabled parameter for skip back and forward
* Updated changelog
* Added AES DRM support
* Added AES DRM support
* Updated documentation
* Updated token based DRM
* Added widevine DRM support
* Dart lint fixes, Dart format
* Dart lint fixes, Dart format
* Dart lint fixes, Dart format
