Pygpgme

* Modernise build system of the project and drop Python 2 support. We
now require Python >= 3.10 to build.
* Add documentation comments (Tim Allen)
* Add support for pinentry mode (Werner Koch)
* Extend gpgme.Context.export() to take an export_mode parameter
(Daniele Ricci)
* Add pubkey_algo and hash_algo attributes to Signature objects (Till Maas)
* Convert enumeration and flag constants to use enum module
types. All constants from 0.3 remain available under their old
names for compatibility.
* The module provides type information, including a stub for the C
extension. This enables mypy type checking for users of the package.
* The test suite has been updated to pass with modern GPG.

* Add support for Python 3 (tested with Python 3.2). Data being
encrypted, decrypted, signed or verified is treated as bytes, while
textual data (including textual representations of binary data like
key IDs) uses the string/unicode type.
* The test suite has been moved to the toplevel and is no longer
installed with the extension.
* The examples directory is now included in tarball releases.

* Update the code base to work with newer versions of GPGME
* Update extension code to make it easier to port to Python 3 (this
version still doesn't support Python 3). In general, this involves
making sure we return Unicode strings for textual data and byte
strings for binary data.
* Add support for the genkey API.
* Add support for symmetric encryption in encrypt().

* Initial Release.