- Add QCU and QCM. Transclusion of them available too. Need to fix a schema validation error when putting a title to a question, without filling the question content.
- Add "Exercice redactionnel" and transclusion.
- Fill-in-the blank (and transclusion)
## Known bugs
- You can have an exercice with no question but a solution. We should add a if statement to handle this.