xF2 Add-on Attachment Improvements By Xon 2.3.1

• Fix error when rebuilding thumbnails ("Return value must be of the type string, null returned")

• Installer now requires php 7+ & XenForo 2.1+
• Add php7 type hinting
• Add icon for options group
• Force global namespace for functions which are known to be optimizable to bytecode in php
• Improve extracting svg dimensions

• Fix XFMG support (ie content stored in data rather than internal_data)
• Support for video stream via partial content requests
• Add "Partial content maximum chunk size" option

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• Require XF2.1+, remove XF2.0 support
• Fix "Call to a member function save() on null" when handing an invalid jpeg
• Fix SVG thumbnail support for XF2.1 (for new attachments)

• Fix "Error: Call to a member function save() on null" when handling Jpeg's without exif information
• Fix compatibility issue with some 3rd party add-ons

• Correctly set "Allowed Image Attachment File Extensions" type as string not boolean