Finalize migration flow:
- Add entry to "Add" menu
- Suggest to migrate old profiles when there are no profiles
- Add informational message
- Keep included profiles on top
- Allow deletion of migratable profiles
- Fix duplicated Form in preview
- Rename views and models
Improve some Theme modifiers:
- Empty message with full screen option
- Progress modifier with custom view
- Confirmation dialog with custom message
Davide