Add-ons Search Improvements 2.17.0

• Remove usage of utf8_* function(s), and use native php multi-byte functions instead.
• Fix HTML markup error in svPushViewOtherCheckIntoXFES option description

• Fix bug where 'weight by content type' feature didn't work as expected in general search
• Thanks to @NamePros for sponsoring this update.
• Display various search term constraints on the search results form.
  For developers to implement support in 3rd party add-ons:
  • Each search constraint needs a svSearchConstraint. prefixed phrase.
    Arrays are mapped to phrases by adding a _ for each sub-array/key as such; c[warning][points][lower] => svSearchConstraint.warning_points_lower
  • Each search order needs a svSearchOrder. prefixed phrase.
  • Extend XF\Entity\Search::getSpecializedSearchConstraintPhrase(string $key, $value) to provide custom phrase handling (ie node names)
  • Extend XF\Entity\Search::formatConstraintValue(string $key, $value) to provide custom formatting.
  • Extend XF\Entity\Search::setupConstraintFields to populate $svDateConstraint/$svUserConstraint/$svIgnoreConstraint properties which control formatting
• Use the debug option "List all unphrased search constraints" which will dump unmapped contraints to search results page.

• Require php 7.2+
• Add ability to push "can view threads/tickets by other" permission(s) into ElasticSearch query, reducing php-side culling of matching content.
  This improves searching forums/tickets where the user lacks these permissions.
  This is gated behind the option Push "View X by others" check into XFES', as it requires a full reindex. (Default disabled)
  Supports the following add-ons:
  • View Sticky Threads (free) add-on.
  • Collaborative Threads (paid) add-on.
  For best results, use ElasticSearch Essentials add-on, as it simplifies this permission constraint compared to stock XenForo