Merge pull request #3194 from arnova/slow_picture_job_fix

changed: Pause low priority jobs when loading/showing pictures

diff --cc xbmc/Application.cpp
Simple merge

diff --cc xbmc/TextureCache.cpp
Simple merge

diff --cc xbmc/cores/paplayer/PAPlayer.cpp
Simple merge

diff --cc xbmc/video/VideoThumbLoader.cpp
Simple merge