[Xon] Search Improvements 2.17.0

Search extensions API changes for better XF compatibility, required for Conversation Improvements/Essentials

XF2.3 compatibility fix for custom "SearchOrder" class
Simplify asSqlConstraint code (expected to always return an array)
AbstractConstraint::setMatchType needs to normalize to an int for MetadataConstraint::matchType

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Add additional hookpoints for customizing "specialized search indexer" functionality
On search results page, when searching a conversation(XF2.2)/direct message(XF2.3) display "with conversation/direct message"

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Improve 3rd party support for specialized search index support

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Enhanced specialized search with additional debug capabilities
Update specialized search to support SearchOrder type
Fix XF2.1 when using specialized search functionality (aka fix tag/user autocomplete with XF2.1)

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