- added custom events processing on main thread for plugin fullscreen window, this is similar to Cocoa [performSelectorOnMainThread]
- ShowWindow/HideWindow for plugin fullscreen window are now run on main thread as they are not thread safe and may cause crashes

#define PROTECTION_LEVEL_UNRESTRICTED  10  /* For peer-to-peer apps */
#define PROTECTION_LEVEL_DEFAULT       20  /* Default level         */
#define PROTECTION_LEVEL_RESTRICTED    30  /* For Intranet apps     */

closes #827

* Improve avformat demux SET_POSITION.
* Add WavPack ID for ffmpeg demux
* Add Speex ID for avi files

* check whether p_item->input.psz_name exists, because stringWith*String crashes on non-existant strings

* backport [17543] : Fix mpeg2 PTS/DTS for field pictures

  Attach the Callback before setting the value, if you depend on information being properly set by that callback

 * skins2/parser/skin_parser.cpp: Fixed a crash due to incomplete backports. Also fixed another problem of the same kind.

* Don't skip the Real RTSP access if it is NOT forced. (apparently b_force was broken before or something ? )
  This fixes #821