Similar threads 8.8

Similar threads v6.7 changes:

Fixed issue with non language characters causing regexp to fail.

Similar threads v6.6 changes:

Fixed issue with closing similar threads results when message body gets focus.

Similar threads v6.5 changes:

Removed Stop characters field from options page.

Similar threads v6.4 changes:

Fixed issue with single quote in thread title causing errors.

Similar threads v6.3 changes:

Fixed issue with scrollbar in responsive mode.

Similar threads v6.2 changes:

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

Similar threads v6.1 changes:

Fixed issue with Elasticsearch 7.6.0 causing server error logs.

Similar threads v6.0 changes:

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

Similar threads v5.9 changes:

Added additional code to prevent server error logs during times when elasticsearch is not available.

Similar threads v5.8 changes:

Added additional CSS to the andy_similarthreads.less template. This allows adjusting the margin of the similar threads block.

Similar threads v5.7 changes:

Removed auto close function. Similar threads now remain displayed while composing message.

Similar threads v5.6 changes:

Similar threads in responsive now shows just the thread titles.

Similar threads v5.5 changes:

Fixed issue when quick thread is disabled. JavaScript error was showing when quick thread was used.