OO-449 OO-448 OO-450 fixing configuration issues and dependencies in IM module, adding context help and translations, some GUI optimizations

OO-449: implements notifications for private message, download of log in course and group, archive of log by course deletion...

OO-449: first part of the implementation: remove smack libraries, refactor controller and unify them, implements messaging across the OpenOLAT event bus, implements administration part to enable chat...

OO-360, removing warning ifan IM listener is not found (it can happen), remove support for SSL connection to openfire to save memory

OO-291: make the synchronization groups to IM more configurable with a sync all, per group config, never

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branch : bps