Improve release packaging and add more supported platforms

[grunt-lucas]

• Add support for Windows via MSVC? MinGW?
  • Apparently it is possible to build a cross-compiled version with minGW on a macbook:

  brew install mingw-w64
  cd porytiles
  make clean && CC="x86_64-w64-mingw32-gcc" CXX="x86_64-w64-mingw32-g++" make
  

  • you can extract this and steal the libpng.a file https://packages.msys2.org/package/mingw-w64-x86_64-libpng
• set up package caches so installs don't have to run every time
  • probably too hard to do with homebrew, apt
• Mac universal binary?
  • https://stackoverflow.com/questions/67945226/how-to-build-an-intel-binary-on-an-m1-mac-from-the-command-line-with-the-standar
• static analysis: https://nrk.neocities.org/articles/c-static-analyzers