Request: support multiple wifi profiles

[andypiper]

Unsure whether this should be an app, or built-in?

Notionally, this is a straightforward (!) as having an array of network settings in the settings, and swapping them in and out as needed. That's the basic idea I had for making an app to do this, anyway. Should it be part of the core though...

[andypiper]

In the meantime I wrote a quick script to poke relevant values into the badge from outside.