Replace windows-sys with windows

[pronebird]

This is a backburner PR for replacing windows-sys with windows crate.

It started as a side effort to update to windows-sys 0.59, which immediately caused issues with socket2 due to peer dependency conflict with windows-sys. Upon further inspection, I realized that we don't really use socket2 for anything but converting between windows native net types and Rust std::net types.

Now the reasons to go with windows instead of lower level windows-sys:

• Support for most of non-fallible conversions between SOCKADDR_INET, SOCKADDR_IN, SOCKADDR_IN6, IN_ADDR, IN6_ADDR and IP{v4,v6}Address, SocketAddr, SocketAddrV4, SocketAddrV6
• Fallible WinAPI calls return windows::core::Result
• Fallible WinAPI calls returning WIN32_ERROR can be turned into windows::core::Result by calling ok() which removes the need for win32_err macro
• We can remove socket2 from dependencies and only implement a single missing conversion from SOCKADDR_INET to SocketAddr

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