Pysaml2

- Add support for MDQ signature verification
- Raise XmlsecError if xmlsec1 operations do not succeed
- Handle non standard response error status codes correctly
- Remove the hardcoded warning filter; pass -Wd to the python
interpreter to enable warnings
- Remove the python-future dependency and only use six
- Minor python2 and python3 compatibility fixes
(unicode strings and example code)
- Minor documentation fixes

- Fix for response status error case handling (introduced in v4.6.5)
- Added assurance-certification support
- Added entity-category-support support

Thanks rectalogic skanct

- Make use of the sign argument to entity.Entity::apply_binding when binding is
HTTP-Redirect. Reminder: use [authn_requests_signed configuration option][0]
to indicate that Authentication Requests sent by the SP must be signed
- Add want_assertions_or_response_signed configuration option - see
[documentation][1] about the introduced behaviour
- Fix code for idp and sp examples
- Do not require assertion conditions
- Fix response encoding format
- Various code improvements for config, sigver, client_base, client,
ecp_client, ecp, s2repoze and entity modules
- Support non-ascii attribute values for encryption and decryption

Thanks to johanlundberg skoranda yuqing0708 erakli

[0]: https://github.com/IdentityPython/pysaml2/blob/master/docs/howto/config.rst#authn-requests-signed
[1]: https://github.com/IdentityPython/pysaml2/blob/master/docs/howto/config.rst#want-assertions-or-response-signed

Do not map between attribute FriendlyName and attribute Name when no attributemaps are provided.

------------------

Refactor AttributeValueBase::set_text method.

- set_text is doing too many things. At least the structure is a bit cleaner;
though, still complex.
- set_text will set the type if no type has been set.
- set_text should not modify the type if it has already been set,
- set_text should not depend on the type's namespace.
- set_text should not interfere with the 'anyType' type.
- set_text will raise a ValueError if the value cannot be represented by the
type.
- set_text will raise a ValueError if the type is unknown.

------------------

- Allow multiple AttributeStatement tags per Assertion
- Raise ValueError for invalid attribute type
- Make NameID element optional
- tests: fix test that depended on actual datetime
- build: Set minimum build-tool version through pyproject.toml