Generator routes Structures

Generator routes Structures

* new: application_name.dart
* Routes: uses module name instead of lowercase module name
* new: Structures
* new: AttendedStateful as base class for all meta data driven pages (StateFulWidget).
* new: Handling of multiple asynchronous db requests: DbDataState
* WidgetForm:
** new: flexibleGridAttended(),
** parameters changed: flexibleGrid(): works on a widget list (instead of an AttendedWidget list)