(fixes some deadlocks/crashes when switching between layouts with
 the default skin)

  * both ways in !Win32
  * only wx->skins in Win32

Happens in particular if CAM decryption fails on channels where the pcr pid is 
encrypted but other pids are not encrypted.

Revert [15458] and change default scrolling behavior to "stoped". You need to click on the text to start the scrolling.

 (hope it works ;)

Add scrolling="autooff" : same behavior as "auto" except that it starts in the soped state. Use that in the default skin.