Introduced DB relation names for the DB-aware data containers.
Moved var components and utils to the Utils module.
Separated implementations of array-backed and coll-backed container vars.
Improved assertion error messsages in property utils.
Fixed bug in DB ref (when setting a null value).
Enhanced value display and increased customization support in form widget.
Handled value setting and retrieval in special bean properties of "var" type.
Marked the Entity super-class as Serializable.
Removed the "display" property from the User model.
Refactored back navigation.
Improved login flow (to navigate to the last page after a login).
Refactored out app screens construction into new customizable component.
Moved the Scaffold annotation to the Utils module.