Add-ons Search Improvements 2.17.1

• Support tag/username autocomplete using XFES add-ons todo prefix matching on autocomplete

• During upgrades, fix " Access to undeclared static property " error.
• Do not show the "Tags will be searched" tooltip as part of "Search titles only" in advanced search for content types which do not implement tagging

• Improve how thread/tickets by others in a category without view-other permission are filtered out of search results when using XFES without ElasticSearch Essentials
• Add PermissionConstraint helper class, designed to simplify implementing XF Search handler's getTypePermissionConstraints function
• Add "Collect search DSL & debug statistics" option (Default off), designed as a developer tool and strongly not recommended for production usage.