add images to spec file

FS-7656 fix various edge cases with video and non video files mixed into a source, fix a typo bug in file_read_video and fix same bug in mod_vlc, add a new flag to file_read_video to check if the handle is has active video, make mod_conference move the video in and out of a layer when the stream has video or not

* commit '81190c6d':
  FS-7644. Fix build on VS2013/Win by creating and forcing nf (nofork) to true.
  FS-7644. Remove non-existent projects.
  FS-7644. Add switch_core_video.c and switch_vidderbuffer.c to VS2013 FreeSwitchCore.2013.vcxproj
  FS-7644. Change 2013.vcxproj references to 2013