Attachment Improvements By Xon 2.5.0

• Require Standard Library by Xon (free) v1.1.0+ add-on
• Only support range-requests for local files, not remote filesystems as the underlying library does not support determining if this is suppotred.
• Ensure attachments SVGs are only served as images if it is known to be valid, and inline display of SVGs is permitted.
• Remove non-implemented "Allowed Image Attachment File Extensions" option
• Add "Allow inline display of SVG image attachments" option, defaults to off (breaking change)

• Require XenForo 2.2+
• Require php 7.2+
• Improve drag&drop editor support. Thanks to @NamePros for sponsoring this feature.
  • Stock XenForo/Froala uses "move" which can result in unexpected content deletion.
  • Tint the active editor's boarder when dragging items over it, and show a file upload symbol over it.

• Fix attempting to extract svg dimensions from <svg viewData> attribute

• 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

• 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

• Fix per-forum attachment permissions not applying

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