Make the code more manageable

[brianegan]

Code needs a good refactor / clean up.

[cbenhagen]

Please add some details about this. I'd like to give this a try.

[brianegan]

Hey there -- my idea was to replace all StatefulWidgets with a ChewieController, similar to the VideoPlayerController or TextEditingController. The ChewieController would contain a few methods, such as play, enterFullScreen, etc. It would also contain the data to be rendered on all the Widgets, probably as Listenables, such as ChangeNotifier or ValueNotifier.

Rather than passing enterFullScreen methods down the Widget Tree, the ChewieController would be wrapped in an InheritedWidget that all sub-Widgets could access.