Better usage statistics

@meee1 For the sake of Dronecode statistics it would be great to add / extend some of the statistics functionality you have.

It would be great to extend the URL with get params like:

```
http://s3bucket/binary?ap=&id=&stack=
```

For MP statistics themselves, it would be great if it would open the MP website on boot to check for updates like:

```
http://updatesite.org/updatecheck/?id=&gcs=mp&version=
```

and:

```
http://dronecode.org/updatecheck/?id=&gcs=mp&version=
```

The issue names no files, tests, or entry points. First locate the existing usage-statistics and startup update-check functionality, then verify how autopilot type, UID, firmware stack, GCS, and version values are obtained; done means both requested URLs receive the specified parameters and the checks run as described.

Written by the indexing model from the issue text.