Build with Qt6
- Fix building KF6 with PackageKit-Qt
- Fix build with Qt6 QFont::setWeight()
- Add missing includes needed to build with KF6
- ServiceMenus installation location has changed in KF6
- KServiceTypeTrader has been deprecated since KService 5.90
- Fix version macro with respect to finding "KFileItemAction/Plugin" services
- Port away from deprecated KNewStuff API
- Merge two relevant ifdef blocks
- Fix building kfileitemmodeltest with KF6
- Port away from copying QEvent when building with Qt6
- Kdelibs4ConfigMigrator is deprecated in KF6
- Port away from deprecated ThumbCreator API
- Migrate old custom view font config entries
- Simplify custom font settings