- Add XAdES support
- Migrate all configuration inputs to enums (string identifiers are still supported, but will be deprecated in a future version)
- Migrate structured data inputs to dataclasses
- Deprecate excise_empty_xmlns_declarations
- Documentation and test infrastructure improvements
- Clean up top level signxml and signxml.xades namespaces
- Stop using default_backend for cryptography, it is no longer required
- Drop Python 3.6 support (200)