Iplib3

[Semantic Versioning]: http://semver.org/

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Updated dependencies, added `py.typed`, swapped linters to Ruff, fixed lint
issues, and removed support for Python 3.8 due to type hint changes.

Added

- `py.typed` is now present, letting `mypy` use the provided type hints
- Added a workflow for Ruff

Changed

- Ruff replaces Pylint an Flake8 as linters
- Cleaned up the source code with Ruff
- Updated dpendencies
- Updated `Makefile`

Removed

- Removed the old workflows for Pylint and Flake8

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Updated dependencies, stopped ignoring `poetry.lock`, and upgraded workflows.

Added

- New workflows for code analysis and automatic dependency updates
- Automated GitHub releases

Changed

- `poetry.lock` is now included in the repository
- Updated project metadata files for consistency
- Updated old workflows

Removed

- The old `deploy.yml` was removed in favour of `pypi_deploy.yml`

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Small changes, such as the new `Makefile`.

Added

- Added a `Makefile` to make testing the codebase easier/more streamlined locally on Linux/Unix platforms
- Added Tox as a development dependency

Changed

- Changed the `README.md` badge chain to a table with the badges split into categories
- Updated localisation files

Removed

- Removed `pytest-runner` as a development dependency, as it's useless with Poetry

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A quick fix to resolve Snyk throwing errors due to the empty `requirements.txt`
file.

Changed

- Updated localisation files

Fixed

- Snyk throwing a fit on pull requests
- Missing coverage from `iplib3.address`

Removed

- `requirements.txt`

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This release focuses mostly on back-end changes, but there are a few additions
to functionality as well. Things have moved around, new unit tests have been
added, and the overall structure of the project is now more manageable. Most
importantly, however, the project has now been transitioned to use `poetry` as
its build system and this transition has enabled many of the old config files
to be removed. The entire project now uses `pyproject.toml` for all
configuration, from builds to unit tests. In addition, the GitHub Actions
workflow has been split into multiple workflows, it now uses Tox, and the
project is now additionally linted using `flake8`; previously only `pylint`
was used.

Added

- `iplib3.constants`, a new sub-package used to store all of the constant
values used by the project.
- `iplib3.subnet`, a new submodule housing new subnet objects. At this
stage they remain unused, though the code has been unit tested.
- `iplib3.validators`, a new submodule for validator functions.

Changed

- Validator functions from `iplib3.address` and `iplib3.subnet` have been
moved to `iplib3.validators` to keep the codebase more maintainable.
- Constants originally defined in `iplib3.address` and `iplib3.subnet`
have been moved to `iplib3.constants`.
- Some validators, including `port_validator`, `ip_validator`,
`ipv4_validator`, `ipv6_validator`, and `subnet_validator`, have been
added to the public interface. Previously they were considered private.
- Steps have been taken to reduce code duplication and complexity by creating
new, currently private helper functions. This will be a key point in
future development.
- `iplib3.PureAddress` is no longer an abstract base class, as it caused
difficulties in unit testing. It has been reworked into a concrete class.
- Updated localisation files

Deprecated

- The `requirements.txt`-file is no longer used for anything, it may be removed
in a future version. Then again, it has been kept empty so far as the library
currently lacks non-development dependencies.

Fixed

- Hundreds of linter errors
- Unit test coverage (previously ~70%, now 100%)
- Bugs related to equality testing of addresses
- Bugs related to initialisation and construction of `iplib3.IPAddress`

Removed

- `setup.cfg`
- `setup.py`
- Scripts related to running tests (now handled by Makefile and/or Poetry)

Security

- Added Snyk integration to sniff out vulnerabilities

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