Html5 casting icon to use same logic as mute button

- utils.addClass and utils.removeClass now accept arrays
- map added to jwplayer._
- [Fixes #77828632] Note, this will not deliver since it requires a change in private repo as well
This will result in multiple 'writes' to ```className``` which may result in as many layout or repaint events in the browser. Can you optimize so that we only set className once?