Requesting partial lists would interfere with Spring caching so
pagination is handled by the newly introduced PaginationListDecorator
in the controllers. This additionally allows to determine the total
count of items (independent from pagination parameters) which is not
possible with CouchDB.

Task #15666
Task #15693

Worked on #15326. Implemented controller, configurable properties imgupload.thumbnail.{width, heigth}, stared on working on communication between client and server.

#15362 alphabetical sortOrder is now automatically created when there is no sortOrder. bugfix included

#14886 edited the lecture/preparation view to use new sort_question-views, saveOrder is not checking whether there is already a list

Worked on #15326. Implemented controller, configurable properties imgupload.thumbnail.{width, heigth}, stared on working on communication between client and server.

The delayed pi-round change can now be triggered via a simple api call.
After the api call a timed task will be started, which executes the
necessary steps for a round change. 

#14886 edited the lecture/preparation view to use new sort_question-views, saveOrder is not checking whether there is already a list

count to NewAnswerEvent websocket broadcast. Task #14471

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

preperation questions. Task #14343