2V1-b/c: PythonNetworkStream phases, AccountConnector and the net module

Port PythonNetworkStream with its HandShake/Login/Select/Loading/Offline
phases, AccountConnector and PythonNetworkStreamModule verbatim; the net
stub goes. PythonBoot creates the network stream, account connector,
player, flying manager and effect manager like CPythonApplication, and
app.Create/Process drive CNetworkDevice and both connectors.

Packet.h long fields become 32-bit LONG; port.packet checks 38
login/select/loading packet sizes against wire_classic.h. Unported units
in the link closure live under platform/pending/ as stand-ins. The macOS
gate now builds all and finds iconv.

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

extension/src/port/UserInterface/PythonNetworkStreamEvent.cpp

@@ -0,0 +1,18 @@
+#include "StdAfx.h"
+#include "PythonNetworkStream.h"
+
+void CPythonNetworkStream::OnRemoteDisconnect()
+{
+	PyCallClassMemberFunc(m_poHandler, "SetLoginPhase", Py_BuildValue("()"));
+}
+
+void CPythonNetworkStream::OnDisconnect()
+{
+}
+
+/////////////////////////////////////////////////////////////////////////////////////////////////////////
+// Main Game
+void CPythonNetworkStream::OnScriptEventStart(int iSkin, int iIndex)
+{
+	PyCallClassMemberFunc(m_apoPhaseWnd[PHASE_WINDOW_GAME], "OpenQuestWindow", Py_BuildValue("(ii)", iSkin, iIndex));
+}