LocalServerCodeReceiver.cs uses 127.0.0.1, which breaks non-admin Windows 7 & 8.1 clients

[chrisdunelm]

As reported by @aluxnimm in #987:
This change seems to break Windows 7 and 8.1 clients without admin privileges since HttpListener gets Access Denied for everything except localhost and 127.0.0.1 is only working in Windows 10, see discussion here https://stackoverflow.com/questions/4019466/httplistener-access-denied

We could try "localhost" and fallback to "127.0.0.1" if the HttpListenerException is thrown.

[chrisdunelm]

Wrong way round. It should try "127.0.0.1" first, then "localhost".