Update replaygain ffmpeg input code to handle API changes in libavcodec.
BUG: 487


git-svn-id: http://cantata.googlecode.com/svn/trunk@4858 b1e49159-3266-923f-9c3e-04f16369770a
Call QCoreApplication::setAttribute(Qt::AA_DontShowIconsInMenus) earlier on


git-svn-id: http://cantata.googlecode.com/svn/trunk@4859 b1e49159-3266-923f-9c3e-04f16369770a