A simple chat application

We have the basic framework in place to handle connections, so let's build something with it! How about a neat little console-based chat program? Let's start with the server by creating a separate project and a new file called Server_Main.cpp. The first thing we're going to need is a packet handler:

void Handler(sf::IpAddress& l_ip, const PortNumber& l_port,
  const PacketID& l_id, sf::Packet& l_packet, Server* l_server)
{
  ClientID id = l_server->GetClientID(l_ip, l_port);
  if (id >= 0){
    if ((PacketType)l_id == PacketType::Disconnect){
      l_server->RemoveClient(l_ip, l_port);
      sf::Packet p;
      StampPacket(PacketType::Message, p);
      std::string message;
      message = "Client left! " + l_ip.toString() +
        ":" + std::to_string(l_port);
      p << message;
      l_server->Broadcast(p, id);
    } else if ((PacketType)l_id == PacketType::Message){
      std::string receivedMessage...