KWalletEditor no longer depends on Qt3Support

I've just commited to trunk (KDE 4.7) the last of the changes I started doing a few days ago to make KWalletEditor not depend on Qt3Support/KDE3Support. Basically that meant rewriting all the Q3IconView and K3ListView as KListWidget and QTreeWidget with the associated Drag&Drop changes. I've been testing the code for the usual problems of this type of porting while doing the code changes but something might have escaped me so I'll be more than happy if you give it some usage and report to me any problem you might find.