Added basic Windows service registration, so the "binary archive" can work on Windows.
Recommended installation (until this gets officially documented):
1. Extract files to a directory, say, C:\ (you'll see things in C:\helix-web-services)
2. Open up a PowerShell terminal as administrator
3. Run C:\helix-web-services\bin\configure.exe
4. (Optional), reconfigure C:\helix-web-services\etc\helix-web-services.conf
5. Start: sc.exe start "Helix Web Services"
TODO: This runs as Local System, which I guess is what we want?