xF2 Add-on Similar threads 8.2

When creating a new thread, the similar threads dropdown will stay open. Added a cancel button to allow closing the similar threads dropdown during thread creation.

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Fixed issue with thread title having "|" character.

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Fixed issue with thread title having multiple "+" characters.

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Added unicode support to regex.

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Fixed issue with non language characters causing regexp to fail.

Fixed issue with single quote in thread title causing errors.

Fixed issue with scrollbar in responsive mode.

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Similar threads results block now has scrollbar to allow viewing additional results.

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Fixed issue with Elasticsearch 7.6.0 causing server error logs.

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Added bottom margin to similar threads block. Also updated PHP code to prevent server error logs if elasticsearch is not available.

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