libsidplayfp-python-0.0.7a0

Small maintenance release to support (more) modern Python packaging.

• Modernized installation procedure. Use pyproject.toml to describe the build process. See #2.
• Remove HardSID wrapper as it will be removed in the upcoming version 3.0.0 of libsidplayfp. Furthermore, it has not been part of the default build of libsidplayfp since 2016, see #2.

Full Changelog: https://github.com/mtimmerkamp/libsidplayfp-python/commits/v0.0.7a0