Merge branch 'feat/study-closing' into feat/study-closing-studystatus

# Conflicts:
#	core/lib/src/models/tables/study.dart
#	designer_v2/lib/common_views/action_popup_menu.dart
#	designer_v2/lib/features/recruit/study_recruit_page.dart
#	designer_v2/lib/repositories/study_repository.dart
#	designer_v2/lib/services/notifications.dart
#	designer_v2/lib/utils/model_action.dart