Media player: Clientside IO actions

This will be amazing to have IO actions like setMedia, voteSkip, Skip, Pause/Play as clientside functions, since we got clientside feature on Global Messages module.

It basically should work the same way, so if button will have voteSkip, it will count vote as toggle for each player, just not through UI

Same would be nice to have an action to toggle media player itself.
It will activate/deactivate media player for player on button press. (I know, that there’s going to be a special volume for that kinda thing, but still)