- 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.
Added motion creation view, motion update view, version permit and delete view, view to support motions, view to set and reset state. Refactored motion submitters and supporters.