styles for youtube(desktop)
The ui modual of youtube is reorganized.
* For the Style Tight, the Comments, the Related and the List are tabulated into right sidebar. So you can watch video while watching the comments,related video or list.
* For the Style Recover, no extra style is applied. The original youtube ui are represented.
* Add a auto-repeat button on the play control bar(only works for html5 video player).
* When "Skip Ad" button appears, it is clicked automatically.