v0.4

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