xF2 Add-on Search Improvements 2.13.0

• Compatibility fix for Threadmarks v2.8.0+ and possibly other add-ons which may extend search page defaults
• Requires php 7.0+
• Now depends on Standard Library by Xon
• Support XF2.2+

• Improve MySQL range-search support for Report Improvements warning points search

• Require XF2.1+
• Rework "Allow empty search" support, support for XF2.1.8+ features and also XF2.1.0+

• Add missing phrase for admincp user change log

• Do not apply content weighting which skips content types for content type specific searches

• Fix search breaking when a user could see all forums, and setting content weighting was set to 0 to exclude that content type from search
• Setting content weighting to 0 now excludes a content type for all sort orders, not just relevency

• ElasticSearch v5 compatibility fix for content type weighting in search results

• A content type weighting of zero now correctly excludes that content type from results

• Fix that * was injected for member-like searches

• Fix content weighting values being clamped to 0 or 1
• Fix "Allow empty search" to work as expected without ElasticSearch Essentials installed