Fix usergroup mention's editor integration causing a non-deterministic javascript stack overflow when using the FireFox plugin Decentraleyes
Fix "structured text" user-group mention linking could disclose user-group ids if the visitor didn't have permission to view user-groups
The "structured text" type (vs bb-code) isn't used in stock XenForo, but 3rd party add-on's could use it.
Fix "structured text" user-group mention output was missing attributes from bb-code output target
