packet sniffing for windows

This crate provides one function recv_all_socket which creates a socket2::Socket that receives all incoming and outgoing ipv4 packets.

Example

```rust use pack2::recvallsocket; use std::mem::MaybeUninit;

fn main() -> Result<(), Box> { let socket = recvallsocket()?;

let mut buf = vec![0u8; 65535];
loop {
    // This is safe as described in the documentation of socket2::Socket::recv_from
    let buf_maybe = unsafe { &mut *(&mut buf[..] as *mut [u8] as *mut [MaybeUninit<u8>]) };
    let (read, addr) = socket.recv_from(buf_maybe)?;
    println!("received {} bytes from {:?}", read, addr);
}

} ```