[AndyB] Easy search 2.7

Added code to prevent server error if URL query parameter is manually adjusted and out of range.

Fixed issue with page navigation.

Fixed null condition error with searchForums variable.

Thread and resource results now highlight keywords in titles.

Fixed JavaScript issue.

If Enhanced search is enabled and Elasticsearch is not running, users using the Easy search will receive a message indicating that search is currently not available.

Updated Resource manager options, now allows searching by 'Posted by' and 'Resource category' areas

• The search results snippet is now a little darker.

Easy search v1.5 changes:

• Updated phrases and resource results page.

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