windows: Prompt to install WiX Toolset during setup
windows: Drop OS libraries from PyInstaller bundle

PyInstaller seems to bundle dependencies a bit too aggressively.
windows: Drop pyconfig.h from PyInstaller bundle
windows: Add variable for path to PyInstaller bundle directory
windows: Don't hardcode WiX version in pathname
windows: Build initial installation package
windows: Add custom installer workflow

Omit the EULA screen, since it forces the user to click an "I Agree"
checkbox.  Instead, just show the welcome and confirmation screens.
windows: Register .netx and .nxpk file extensions
windows: Fix logic error disabling gstreamer registry updates
windows: Make WiX get VMNetX version from build.sh ${vmnetx_ver}
windows: Re-add msvcr90.dll to package

Microsoft recommends distributing it along with the application.
windows: Resume shipping pyconfig.h

PyInstaller thinks distutils needs it.
windows: Exclude additional system libraries accessed via ctypes
windows: Clean additional files