Kdmp-parser

Changelog
- 11: constexpr, Python stable API, header-only, nits.
- The python module is now PEP-384 compliant and uses the Python stable ABI which means that it should be compatible with every current and future Python 3 versions (12),
- Turned the library into a header-only library (13),
- `constexpr` the library wherever was possible, as well as `const`,
- Fix a bug where the `mmap` return was checked but it didn't invoke `perror`,
- Fix the `DisplayUtils` mess,
- Turn `Page` into a namespace instead of a structure,
- Use `optional` for `VirtTranslate` to handle error case properly,
- Build w/ Py3.6-3.9 on both Windows/Linux in the CI,
- Fix a bunch of small things

Changelog
- 9 Clean-ups from various static analysis engines
- 10 Turn on /W4 for MSVC and -Wall/Wextra/pedantic

Changelog:
- 3 Python 3 bindings
- 5 Move the CI off AppVeyor and centralize everything with Github Actions
- 6 Upload Linux x64 artifacts
- 7 Formatting and README updates
- 8 Hide kdmp-parser structures behind a namespace

The 7z archive contains: a BMP dump, a full dump, a kernel dump, a complete kernel dump and a kernel user dump; those are used to test the parser and avoid regressions.