Move the functions of OlatRootFile and OlatRootFolder to the Local
implementations to simplify the use of VFS, implements factory methods
in VFSManager, reduce the number of call to meta informations in folder
listing

OO-2967: refactor the list of assessed identities in assessment tools to be delivered by the resource or the course element them self

OO-2897: implement last modification per user role (as participant or as coach), aggregate the values on structure nodes

OO-2790: add the options to upload assessment documents on a per course element / user base which behave like the user comment

OO-1761: more fix to the copy of course element within a course, copy or import of a course with a project broker element

OO-1593: return more informations on score evalutation, add a specific persistent assessable course node, fix selenium tests and unit tests

OO-848: extended postCopy() method with source and target Course to get the copy of a whole course working

OO-848: enhance the interface of course nodes to do a post copy processing different from the import one

OO-1152: implemented export/importNode methods to add the project data to the exportprocess of the projectbroker

OO-990: rework importation of course node with references, implement autowiring capabilities in controllers

OO-911, OO-912: implements the course node triggered buttons in assessment tool, implement bulk upload for tasks with selection of a group if needed