Attachment Improvements By Xon 2.7.2

• 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

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

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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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