Module w5500_hl::net

Networking data types.

There may a standard for embedded networking in the future, see rust-embedded issue 348 and RFC 2832

This is mostly ripped from std::net.

Structs

• Eui48Addr
  EUI-48 MAC address struct.
• Ipv4Addr
  An IPv4 address.
• SocketAddrV4
  An IPv4 socket address.