Anonymise PDF/DocX files

[ajrbyers]

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[rhb123]

This would be very helpful for 1.4, although would need to be very robust if we're relying on this for peer-review - thanks

[ajrbyers]

@rhb123 it's mainly for taking it out of metadata but we would still require the editor to check.

[ajrbyers]

@MartinPaulEve has completed this. Merge coming in 1.4