[poppler] [RFC] Add option to strip encryption

[Adam Reichold]

Hello,

the attached patch adds an option to strip the encryption from a
document by doing a complete rewrite but ignoring the original
encryption parameters and removing the encryption entry form the trailer
dictionary. It also exposes this via the two Qt frontends.

This might be useful for a separate command-line utility but for now my
primary use case is submitting a rewritten but unencrypted document to
CUPS for printing instead of converting to PostScript.

Best regards, Adam.

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