* Style fixes for Servent.
* Caution for upcoming changes.
* PlayableItem::forceUpdate() forces a repaint by emitting dataChanged().
* Added custom UserRoles to access model's data.
* Style fix.
* Disconnect from previous query correctly.
* Added ColumnItemDelegate.
* Added ColumnView.
* Added ColumnViewPreviewWidget.
* Added FlexibleTreeView.
* Updated CMakeLists.txt.
* Use FlexibleTreeViews for showing collections.
* Reset the model before applying a filter.