[AndyB] Internal data orphaned 1.2

Checks for orphaned internal data attachment files.

(Example of Internal data orphaned page)


(Example of Options page)


How to use:
Add 'internaldataorphaned' to your forum URL.
Questions and answers:

Q: Who can run this add-on?
A: Only the admin can run this add-on.

Q: Is it normal to take a long time before the results page is displayed?
A: Yes. If you have 500,000 attachments it can take 10 minutes to process.

Q: Is Amazon S3 file storage supported with this add-on?
A: No. This add-on only supports the XenForo default file storage system.