Merge branch 'develop' into release/candidate

* develop:
  Fix icon for quizz answer with hint
  Added method for stat export
  Moved methods to badgemanager
  Refactored badge uses
Fixed crashes in quizz...
Fix quizz errors 500
Fixed design and behaviour when exercise has ended
Added message and removed start/restart buttons in case of not started exercise
fix AutoIncrement in TypeQCM
change creation of 2 first TypeQCM
Merge branch 'develop' into release/candidate
fix div by zero
Merge branch 'release/candidate' into develop