Use systemDir()


git-svn-id: http://cantata.googlecode.com/svn/trunk@4879 b1e49159-3266-923f-9c3e-04f16369770a
Qt5 windows build fixes


git-svn-id: http://cantata.googlecode.com/svn/trunk@4880 b1e49159-3266-923f-9c3e-04f16369770a
Split Application class up for KDE, Qt, Windows, and Mac builds


git-svn-id: http://cantata.googlecode.com/svn/trunk@4881 b1e49159-3266-923f-9c3e-04f16369770a