Better Aspect Fill

[LePips]

Currently, VLCVideoPlayer.Event.aspectFill animation is manually controlled.

Replace to be more customizable by removing the manual animation and replace with:

enum Event {
    /// Aspect fill given the percentage between 0...1.0
    case aspectFill(Float)
}

This would set the aspect fill state to a certain progress. This would allow gestures to set the aspect fill based on its percentage completed and the send event can be surrounded by an animation for animations.

[LePips]

71fcc74