Feature/december changes (#172)
* setControlsEnabled implementation
* Updated documentation
* Fixed video list widget buttons not rendering correctly in small resolutions
* Fixed video list widget buttons not rendering correctly in small resolutions
* Added setOverriddenAspectRatio, added example for overriding aspect ratio
* Fixed deviceOrientationsOnFullScreen for iOS
* Fixed crash connected with setSpeed in Android platform
* Fixed default aspect ratio
* Better Player 0.0.37
* Changelog, dartfmt update