Reflect native controls

In this pull request i will handle the events, when the controls in the extension are clicked.
I should get this data in the `ChromecastComponent::onMediaStatusUpdate` method.

* [X] play / pause
* [ ] mute / unmute
* [x] disconnect

This problem was mentioned in the following issue: https://github.com/benjipott/video.js-chromecast/issues/5

**Update**
I can't find a way to detect if the user has muted the player with the extension. So i will merge this now, and as soon as i find a solution, i will create another pull request.