Add more question types (enhancement)

[ou-li]

i.e. Image Choice as a part of question set
would be very useful for listening exercises in which students have to match audio and visual information.
These exercises typically have more than one question, so grouping them together in a question set would be greatly useful to keep things neat and tidy.

Keep up the good work!

[otacke]

@ou-li Feel free to use https://www.olivertacke.de/labs/2022/04/26/new-content-type-image-choice-rounds/ until Image Choice is included in QuestionSet.