Bug XF.AttachmentManager/XF.ImageTools destroys EXIF data

[DragonByte Tech]

Currently, it is impossible to fully preserve an attachment's EXIF data. There's a number of factors at play here:

• The bundled ExifReader library fails to obtain all EXIF data from sample photos found here: Sample Geotagged Photos and other sample photos I have tested with
• XF.ImageTools.resize() does not abort resizing if the global image size limits are set to 0 or left blank
• XF.ImageTools.resize() will always discard the old image...

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