videodb: SQL query cosmetics in CleanDatabase()
videodb: use faster (NOT) EXISTS instead of (NOT) IN CleanDatabase()
videodb: handle files whose source is completely gone differently during clean
Merge pull request #3739 from koying/fixdroidmousebuttons

FIX: [droid] proper mouse buttons handling
fix crash loading JPEGs where m_cinfo.scale_num was set to 9 due to not finding a suitably sized scale factor. Thanks to tscheck
Merge pull request #3708 from Montellese/videodb_clean_offline

videodb: better support for sources being temporarily offline during a library clean
FIX: External Player support for Android. See: http://forum.xbmc.org/showthread.php?tid=175341