Content format priorization
Add new models and components for content creation, content answering and statistics.
Also introduce new component CreateAnswerOptionComponent
is used by sort, choice and later priorization content creation components.
Depends on https://gitlab.com/particify/dev/foss/arsnova-backend/-/merge_requests/528, !1466 (merged)
Closes #977 (closed)
Edited by Lukas Weingarten