2V1-a: port the EterLib network layer and the Crypto++ packet cipher

NetStream/NetAddress/NetDevice/NetPacketHeaderMap and EterBase/cipher.cpp
are mechanical copies. The winsock shim maps Winsock onto BSD sockets and
keeps the Winsock semantics CNetworkStream relies on: select ignores nfds,
a socket whose connect failed is not writable (40250 times out instead),
EINPROGRESS reads as WSAEWOULDBLOCK, and SIGPIPE is ignored.

port.net covers loopback connect, send/recv, peer close, the refused
connect timeout and the client/server key agreement.

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>

extension/src/port/EterLib/NetDevice.cpp

@@ -0,0 +1,41 @@
+#include "StdAfx.h"
+#include "NetDevice.h"
+
+CNetworkDevice::CNetworkDevice()
+{
+	Initialize();
+}
+
+CNetworkDevice::~CNetworkDevice()
+{
+	Destroy();	
+}
+
+void CNetworkDevice::Initialize()
+{
+	m_isWSA=false;
+}
+
+void CNetworkDevice::Destroy()
+{
+	if (m_isWSA)
+	{
+		WSACleanup();
+		m_isWSA=false;
+	}
+}
+
+bool CNetworkDevice::Create()
+{
+	Destroy();
+
+	Initialize();
+
+	WSADATA wsaData;
+	if (WSAStartup(MAKEWORD(1, 1), &wsaData)!=0)
+		return false;
+
+	m_isWSA=true;
+	
+	return true;
+}