Remove quite a few JuK warnings during program startup by assigning a widget
to the global action collection, and by delaying some player manager
initialization until after the GUI has been created.

Works well over here, shortcuts still work and the player still plays, but I'd
appreciate testing, especially by those who have gstreamer and arts installed.

CCMAIL:wheeler@kde.org

svn path=/trunk/kdemultimedia/juk/; revision=327406