Simplify wifi.save() to be able to drop jswrap_wifi_restore

You mean, move it from firmware to javascript?

Well, sure it's possible ...

With the aim to completely unify board Wifi support I think it would be worth doing as well as perhaps also making it compatible with the http://www.espruino.com/Reference#t_Ethernet interface e.g. the getIP() to be usable with a callback. @Gordon what do you think?

I agree on the memory issues to be fairly pressing but I'd move the related discussion to another forum topic.