add playlist / ytmix support

[Newtoneiro]

I managed to found a issue and a semi solution.

Issue:

Because the cleansed video is loaded in an iframe component, there's been some troubles in loading the playlists. From what I've discovered, the found playList id wasn't even used in code.

Solution:

The embeded iframe component can't be fully connected to the outside layer of youtube app. It is a video player on its own. While I managed to put the playlist into the component, it still will not be fully synchronized with the outside container. The actual played playlist can be displayed from upper right corner of the video player, thus I removed the misleading original yt playlist after loading the video.