Mantis #4472 : Rework Recursive SlideShow to avoid repeated item.
Mantis #4472 : Another tweak to avoid blank screen when using recursive slideshow.
Correct item should be selected to when back after a random slideshow/recursive.
Merge remote-tracking branch 'remotes/origin/master' into BUG-4472-Random_slideshow_in_pictures_can_repeat_some_pictures_and_miss_others

Conflicts:
	mediaportal/WindowPlugins/GUIPictures/GUIPictures.cs
Fix hang when we reach end of SlideShow.
Mantis #4472: Handle going to root folder when using Date display mode.
Mantis #4472: Handle ESC selectemItem when no extension is set in MP Config.
Paused SlideShow when showing EXIF Dialog.
Enable Paused option (when using Space/Remote/Topbar) in SlideShow.
Fix playing Video in Recursive SlideShow or not when 'Show Videos in Slideshows' is set to off.
Fix : Stop slideshow (when doing next) when we reach end of item list.
Fix : In some cases (_returnedFromVideoPlayback stay to true, return to previous windows is done twice, that not correct) Another fix to select correct items when doing ESC.
Fix : Start slideshow from start when using random setting.
Tweak speed (don't do full slide analyse when it's folder).
Fix : Avoid REW/FF/Pause when we are on slideshow.
Fix little change about REW/FF/Pause (enable it when it's video in slideshow)
Reset dlg (showsong before going to fullscreen when starting video in slideshow)
Fix previous commit about _returnedFromVideoPlayback stay to true. Now it will be set to false and fix resume music when stopping/ESC Video in slideshow.
Fix don't resume music (from folder.m3u) for video slideshow when doing a stop/ESC.
Merge branch 'BUG-4472-Random_slideshow_in_pictures_can_repeat_some_pictures_and_miss_others'