* Activate restricted_data_cache on inmemory cache
* Use ElementCache in rest-api get requests
* Get requests on the restapi return 404 when the user has no permission
* Added async function for has_perm and in_some_groups
* changed Cachable.get_restricted_data to be an ansync function
* rewrote required_user_system
* changed default implementation of access_permission.check_permission to
check a given permission or check if anonymous is enabled
These are
- agenda item speakers,
- motion submitters and supporters,
- assignment candidates,
- mediafile uploader and
- chat message users
but only if the user has respective permissions. Fixed#3002.
Removed form_field attributes.
Added extra fields for HTML rendering like label and help text.
Added fields for sorting and grouping. Removed old collection system.
Added config groups to config view via OPTIONS requests.
Regrouped all variables.
Added validation. Changed internal handling.
