[AndyB] Internal data orphaned 1.2

Checks for orphaned internal data attachment files.

(Example of Internal data orphaned page)
View attachment 10643

(Example of Options page)
View attachment 10644

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...

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Added File date column to results page.

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