Query for every available interface

[mcspr]

resolving https://github.com/arduino/mdns-discovery/issues/25#issuecomment-1182464221 issue on Windows, list finally returns available boards instead of nothing receiving end stays the same, sendQuery uses specific Interface to send things

not really sure about

• what errorCB supposed to do when one interface fails, but the rest don't
• what happens when multiple interfaces return the same thing (e.g. lan wifi & ethernet)

[mcspr]

re. <-time.After, those were there for some quick log.Printf checks :) new commit removes those and tries to implement your proposed polling mechanism.

[cmaglie]

@per1234 @ubidefeo do we have some spare time to test this patch?

[ubidefeo]

@per1234 @cmaglie anyone been testing this one?