A collection of improvements to XF's attachment system.
Byte-range support for resumable downloads
Primarily designed for partial content requests for streaming videos, but will work with any file
Dependant on the filesystem /internal_data being local, as the remote file system APIs do not easily support this feature
Improve drag&drop editor support.
Stock XenForo/Froala uses "move" which can result in unexpected content deletion.
Tint the active editor's boarder when dragging items...
