Convert image by domain

xF2 Add-on Convert image by domain 1.6

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Improved PHP code relating to the search index.
Added Referer to options page. This allows converting low resolution photobucket hot linked images to high resolution attachments.
No longer requires a specific image handler. File system operations now using XenForo file functions.
Fixed issue with undefined variable in previous version.
Using XF HTTP client for requests. Now bypasses animated GIF's with over 100 frames.