Missing aliases of AF_INET and AF_INET6?

[Flamaros]

On struct NetworkAddress the family property is exposed as an ushort. I think it would be better if it was at least an alias or an enum, because for the moment the user need import himself std.c.windows.winsock to access it.

[s-ludwig]

The goal is to gradually convert the code to use the data types from std.socket. I started here by accepting AddressFamily instead of just ushort, which is also publicly imported.