Add an getViewModelListBehaviorSubject that simplifies
how to get most model lists in the view
unified update, delete and create methods and removed redundant code from the repos
(where it was possible)
cleaned up the motion detail to not directly use the DataStore
Add information about the "main model" to all ViewModels, to call the
correct constructor in the BaseRepo
Whats still missing, but has not a high priority:
- DateTimePicker. Entering dates through the popup works (but only with
a hack in the config-field.component update() method). Displaying values
from the server does not work. Also the localisation is missing. See
attempts to fix it in the sheared module.
- Errors, if the server cannot be reached. Should be solved in another
PR fixing the datasendservice and make generic error messages.
- Custom translations are missing
