User Mentions Improvements by Xon 2.9.0

This addon is now available on https://atelieraphelion.com

• Require php 7.2+
• Require StandardLib v1.18.0+
• Minor code cleanup, confirm support for one-click email unsubscribe header for XF2.2.15+

• Fix cases where usergroup mentions could unexpectedly not match non-english titles
• Fix linking to report comment from mention email

• Require XenForo 2.2+
• Require Standard Library By Xon v1.12.0+
• Changes for public user-group list view:
  • Implement pagination
  • Add username filtering
• Adjust defaults for new groups to consistently not be mentionable and to be private.
• Fix user-group mentions did not preserve the original order of the groups in the text, resulting in functionally random ordering of groups
• Usergroup mention alerts now list all groups that mention a user

• Fix typo breaking stopping quote emails from opt-out from emails link

• Add "view public groups" permission to registered and guest user-groups on install
• Remove bad permission entries leftover from very old versions; xenforo's permission cleanup has likely zapped these anyway.
• Force global namespace for functions which are known to be optimizable to bytecode in php
• Minor code cleanup

• Compatibility update when resolving an extended class to the root class
• Require Standard Library by Xon v1.2.0+

• Compatibility fix for @Lawrence's Conversation Tools add-on

• Fix possible error when approving user account with some custom fields configurations

Fix "Call to a member function offsetExists() on null" that could occur with some user custom fields configurations

• Fix quoted email phrase
• Improve compatibility of usergroup mention tagging between XF versions (Fix XF2.2.0B2 support)