Updated copyright year and adjusted header format to be consistent over
all files and with other ARSnova projects.

preperation questions. Task #14343

This is no longer needed since the "released for" per question setting
has been removed.

* Organize imports
* Add missing Override annotations
* Remove trailing whitespace

Variable für Schwellwert zur richtigen Beantwortung einer Planquadratfrage im Backend implementiert.

CouchDBDao und Question-Entity um neue Attribute fuer Toggle Anzahl Markierungen aufheben erweitert.

These checks will be done by service and security implementation if needed