OO-763: merge the BaseChiefController with the BaseFullWebappController to flatten the div hierarchy and minimze it

OO-1071: accept 0 as a possible value for the maximum number of participants of a course with waiting list

OO-937: english wording, fix issue with checklist where passed is calculated from the number of checkbox

OO-1059: add notification trigger to create, edit, edit metadata, move, copy, unzip command in briefcase folder

OO-1064: find out mp4 media from the CDATA of an item, enhance the different controllers of QTI preview and editor to show media with a standard mapped URL ( /m/ )