Follow the HTML5 events more in de media-Hls plugin

[FranklinWaller]

Right now all media plugins (Dash.js, NativeHls, BaseMedia) follows the correct HTML5 events. That is triggering canPlay when enough is buffered to call play() on. Right now Hls.js is the only plugin that doesn't trigger canPlay at all. So this results in not having the same implementation across streams. Now we could create a meisterCanPlay but this would be hacky and would probably result in weird behaviours.