OO-1593: fix a critical issue where the content of the QTI 1.2 is not encapsulated in a block element like a p or div

OO-1593: fix some validation errors in qTI 2.1 editor if the user don't click the save button once, add unit tests to check that our item builders generate valid items to start with...

OO-1593: support video in conversion from QTI 1.2 to  QTI 2.1, fix issue with conversion of gap text

OO-1593: add more informations for unkown interaction in editor, add debug informations in the preview of the item's editor (for openolat question types and the others)...

OO-1593: add section and test part in the assessment item session saved on the database (sugesstion R.F.), setup and update script for Oracle, replace identity generation by the classic hilo used in OpenOLAT

OO-1593: fix test feedback, option to enable suspend, fix missing outcomeDeclaration for tests and items, enhance id generator with prefix

OO-1635: replace xslt rendering engine by an hybrid java / velocity rendering engine with integrate with our flexi from framework

OO-1615: springuifie mail package, rest package, question pool module... remove unused dependencies...