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make ip_getter url configurable (#223)

* make ip_getter url configurable

In config.json:

```
"ip_getter": "http://url.tld"
```

Behaviour:

- not set: uses default ip_getter (https://services.buildandshoot.com/getip)
- set to empty string: does not query for external ip at all (useful if
you want more privacy)
- set to alternative url: uses that url to get the ip

NOTE: To work correctly, the configured url should respond with the client's
public ip address in the response body. That is, if you `curl <url>`, it
should only print out the public ip address, nothing more.

* strip whitespace from retrieve ip

* remove config.json entry, default to http on win32

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