xF2 Add-on User Mentions Improvements 2.9.0

• Fix incorrect access level when extending user changelog

• Fix incorrect access level when extending user changelog

• Fix typo in quoted email phrase
• Fix incorrect phrase usage for private groups
• Fix incorrect view permission check on private groups resulting in usergroup membership disclosure if the "[UMI] View mentionable user group members" permission had been granted and the user-group was mentionable.

• Fix typo blocking user mention emailing

• Ensure duplication mention emails for reports are not sent (requires Report Mention Improvements v2.4.0+)
• Fix user mention emails are not reliably sent

• Fix "Call to a member function isValidRelation() on null"

• Restore UI for opt-in/out of mention/quote emails
• Use correct permission names in options text
• Add "Block mention rendering if the user has no permissions to use mentions" option (default disabled)

• Avoid pushing all post notifications through the job notification system (previous add-on behaviour), while limiting how long for initial replies to be sent.
  • Stock XF takes upto 3 seconds per reply to send notifications., add-on limits to 0.5 seconds.

• Require XF2.1+, remove XF2.0 support
• Fix matching usergroups had lower priority than matching users in backend, where the frontend and XF1 version the user-group had priority

• Do not constantly append ?c=... to user group avatar URL when editing the a user group