Rudy/windows cleanup

A bunch of windows cleanup:
- There is the work of @conorbranagan for the UI installer that I got in my branch (#991). Tested on all the machines I had, work both with the command line and by executing it manually.
- Fix for the services_checks renaming to network_checks
- Packaging fixes:
    - Properly bundling gohai with the installer
    - Remove the need to patch spyderlib on the build box
    - Make sure that numpy doesn't get bundled with the agent even if it's installed on the build box, still didn't figure out why py2exe is picking it up.