Update bundled python to Python 3
Since Python 2 is end of life now, we need to think about upgrading the bundled Python executable to Python 3 in the packaging.
Based on the discussion on the mailing list:
For windows, someone newds to show phoenix working in either msys2 or msvc. And if we will eventuallty transition to msvc we also need other dependencies easily available. I am still hoping for those dependencies to become available in vcpkg.
From what I can tell, this is going to be an issue. The wxPhoenix folks don't seem too keen on supporting mingw builds any more. The new wxPhoenix build scripts forcibly change the build environment to msvc even if you tell python distutils to use mingw. The last time I contacted the project they seemed to think that that was our problem even though they broke the previous wxPython build behavior. I haven't tried it in a while but I have been following the project on github and I have not seen any commits that addressed this issue. Given the response I got last time, my motivation is low to fix the issue myself. None the less, there is currently no wxPhoenix/Python3 support for windows.