Attachment Improvements By Xon 2.6.1

Compatible XF Versions 2.x 2.0, 2.1 Additional Requirements php 5.6+
Optionally; Nginx (for X-Accel-Redirect support)

A collection of improvements to XF's attachment system...

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• 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

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

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

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• 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.

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• 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)

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Require StandardLib v1.18.0+
Fix typo 'Strip JPEG EXIF' option text
Fix "Allow inline display of SVG image attachments" option was not actually wired up as expected
Improve resizing of SVGs to avoid unexpected truncation
Improve handling of SVGs which might have been rejected due to formatting
Add "Only admins can upload SVGs as images" option
Add SVG support for XFRM icons

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• php 8.4+ compatibility
• XF2.3 compatbility
• Fix XFRM support when XFRM is installed after Attachment Improvements

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