Pysaml2

- **BREAKING** Replace encryption method rsa-1_5 with rsa-oaep-mgf1p
- Add documentation next to the code

- Add shibmd_scopes metadata extractor
- Allow the Issuer element on a Response to be missing
- Respect the preferred_binding configuration for the single_logout_service
- Fix logout signature flags for redirect, post and soap requests
- Respect the logout_requests_signed configuration option
- Fix crash when applying policy on RequestedAttribute without a friendlyName
- Correctly validate IssueInstant
- Correctly handle AudienceRestriction elements with no value
- Raise InvalidAssertion exception when assertion requirements are not met
- Raise SAMLError on failure to parse a metadata file
- Raise StatusInvalidAuthnResponseStatement when the AuthnStatement is not valid
- Handle all forms of ACS endpoint specifications
- tests: Always use base64.encodebytes; base64.encodestring has been dropped
- build: Set minimum version needed for xmlschema
- docs: Update Travis CI badge from travis-ci.org to travis-ci.com
- examples: Fix example code

- Fix the parser to take into account both the xs and xsd namespace prefixes

- Fix processing of invalid SAML XML documents - [CVE-2021-21238]
- Fix unspecified xmlsec1 key-type preference - [CVE-2021-21239]
- Add more tests regarding XSW attacks
- Add XML Schemas for SAML2 and common extensions
- Fix the XML parser to not break on ePTID AttributeValues
- Fix the initialization value of the return_addrs property of the StatusResponse object
- Fix SWAMID entity-category policy regarding eduPersonTargetedID
- data: use importlib to load package data (backwards compatibility through the importlib_resources package)
- docs: improve the documentation for the signing_algorithm and digest_algorithm options
- examples: fix the logging configuration of the example-IdP
- tests: allow tests to pass on 32bit systems by properly choosing dates in test XML documents
- tests: improvements on the generation of response and assertion objects
- tests: expand tests on python-3.9 and python-3.10-dev

[CVE-2021-21238]: https://github.com/IdentityPython/pysaml2/security/advisories/GHSA-f4g9-h89h-jgv9
[CVE-2021-21239]: https://github.com/IdentityPython/pysaml2/security/advisories/GHSA-5p3x-r448-pc62

- Indicate minimum required python version during installation

- Add preferred signing and digest algorithms configuration options:
Use the new configuration options `signing_algorithm` and `digest_algorithm`.
- Fix signed SAML AuthnRequest and Response when HTTP-Redirect binding is used:
Previously, the query params `Signature` and `SigAlg` were not included.
- Ignore duplicate RequestedAttribute entries when filtering attributes
- tests: Avoid reuse of old test data files