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xF2 Add-on Insert attachment all 1.9

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Fixed issue if alt reference contains a closing bracket.
Fixed issue with file names containing brackets.
Added 'Insert thumbnail' to options page.
Added code to prevent running add-on if ._xfImport is contained in any posts.
Now works with XF v2.0 and v2.1.​
Fixed issue dealing with thumbnail attachments not being recognized as being inserted into the message.