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Implement framework for flexible 2FA #379

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This adds support for using the hmac-secret FIDO extension to contribute keying material for a KeePass 4 file.

It does this by storing an additional XML statekeeping blob in the outer ("public") header. This blob is designed to hold a variety of different authentication factors, such as passwords, key files, and Yubikey challenge-response devices.

This is a reopening of the accidentally-closed #373 . Sorry about that.

This adds support for using the hmac-secret FIDO extension to
contribute keying material for a KeePass 4 file.

It does this by storing an additional XML statekeeping blob in the
outer ("public") header. This blob is designed to hold a variety of
different authentication factors, such as passwords, key files, and
Yubikey challenge-response devices.
if "public_custom_data" in kdbx.header.value.dynamic_header:
del kdbx.header.value.dynamic_header["public_custom_data"]

# Beyond Python 3.7, construct makes the base class of a Container be `dict` instead of `OrderedDict`
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This is very unfortunate: the construct library dynamically changes which methods are available on a Container based on the version the Python interpreter reports.

If you run Python 3.5, you get all the OrderedDict methods. If you run Python 3.11 you get only dict methods.

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