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Search Improvements 2.9.1

This update will require a full search rebuild, truncating the index before re-indexing.

Require Standard Library by Xon v1.18.0+
Workaround for XF bug where the search URL did not contain the various query string arguments, causing issues when the URL was shared
Workaround for XF bug where the search ownership check wasn't strict enough
Workaround for XF bug where a user's recent content had a "view more" link which rendered even if the visitor didn't have permission to search
Move some permission handling code into StandardLib so it has a common hook point
Fix edge case where XFES is installed by not enabled causing XFES-only code-paths to be triggered
Fix reporting search terms without phrases on the results page return false positives
Fix various search result terms missing phrases, bad rendering of links
Fix pushing viewable ticket category constraints into ElasticSearch for NixFifty's Tickets add-on
Search result terms are now sorted to pull known important bits first
Add various helper functions & template macros for writing search criteria
Improvements which require ElasticSearch (aka Xenforo Enhanced Search)
- Support for ElasticSearch Essential's "container only" search term result criteria
- Tickets:
  - Search by min/max number of replies, sort by number of replies
  - Search by ticket participants