Support for Windows API

[lorenzleutgeb]

There is ::windows::Networking::ServiceDiscovery::Dnssd. For better documentation, refer to Windows Runtime API documentation part of the Universal Windows Platform documentation.

The central functions of relevance for zeroconf are:

• DnsServiceBrowse in windns.h: "Used to initiate a DNS-SD discovery for services running on the local network."
• DnsServiceRegister in windns.h: "Used to register a discoverable service on this device."

I found this via https://github.com/Johannesd3/win-dns-sd

Since this would allow zeroconf to work on Windows without installing additional components such as Bonjour, I think it would be very interesting to explore integration of it in addition.

[windy1]

Would love to support this. As a bit of background, the reason we have Bonjour before this is that Windows wasn't originally supported, and it was relatively trivial to get bonjour-sys to compile on Windows.