Jamendo radios are accessed trough the demuxer, otherwise the SD script will be too slow.
The demuxer should also resolve all the Jamendo api calls to the track unit, xml only.

It closes #2272 and #3350.

This patch
    - uses owner/owned windows so that all skins2 windows get
    minimized at the same time
    - add WS_MINIMIZEBOX to enable minimize in taskbar button
    - some cosmetic

if not managed, vlc terminates with a "vlc: Fatal IO error: client killed"

It closes #3339 (the stream is correctly detected), but as the 302M content is
not PCM data (probably AC3 or Dolby E), the audio is not correctly decoded.

Close #3347

Close #3348

 It is ugly to have this list of codec id (as it can become unsynchronized), but
ffmpeg does not provide a way to retreive this information :(

picture_New() will now always return a picture having
 - pitches multiple of 16.
 - chroma pitches multiple of the luma one.
 - a bit of extra height (as it can helps some ASM functions).