Multi-thread version

[Largo2005]

I know this is an old project that hasn't evolved in a while, but it's still useful to have this kind of tool for debugging, especially when you can't install more complex tools like Wireshark.
However, I needed a version of your tool that supports concurrency, so I updated the code to add multi-threading support on the Windows platform. Since I’m using the libwinpthread library, the code should also be compatible with Linux or macOS, though I haven’t tested it on those systems.
If you're interested, let me know. I'm not sure if I can commit it to a separate branch.