Adds a repository to remove the logic in the motion domain object
The repository will add a new model layer between the components
and the domain objects
implicitly add a new buttion into the motion detail view
- remove motion version
- migrations for versions and change recommendations
- Redone motion comments. Wording changed from comment fields to comment
sections
- fixed test order, tests are not atomic
- introduce get_group_model. Just use OpenSlides Groups and not the
django's ones.
- core modules contains core services
- shared module contains "dumb" components (directives, models)
- used by nearly all modules
- site, it's children and projector are now feature modules
- full lazy loading with independent routing
- routing for children (extremely helpful for plugins (later))
