Adds initial intermediate qt6 porting state

qt6-after/qt6-migrated-legatus/Z/src/tcpserver/cbi_shutdown.cpp

@@ -0,0 +1,25 @@
+
+
+
+#include "cbi_shutdown.h"
+#include "tcpserver.h"
+
+CBI_Shutdown::CBI_Shutdown(unsigned short port)
+  : CommandInterface(port, "SHUTDOWN")
+{
+  connect(this, &CBI_Shutdown::shutdownRequest,
+          TcpServer::instance(port), &TcpServer::shutdownRequest);
+}
+
+void CBI_Shutdown::handleCommandInternal(const QVector<QByteArray> &)
+{
+  writeOk(QLatin1String("Shutting down server - bye!"));
+  closeConnection();
+  emit shutdownRequest();
+}
+
+QString CBI_Shutdown::help() const
+{
+  return QLatin1String("SHUTDOWN - shut down the server");
+}
+