Add-ons User Mentions Improvements 2.10.4

• 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