Adds initial intermediate qt6 porting state

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

@@ -0,0 +1,19 @@
+
+
+
+#include "cbi_quit.h"
+
+CBI_Quit::CBI_Quit(unsigned short port)
+  : CommandInterface(port, "QUIT")
+{}
+
+void CBI_Quit::handleCommandInternal(const QVector<QByteArray> &)
+{
+  writeOk(QLatin1String("Bye!"));
+  closeConnection();
+}
+
+QString CBI_Quit::help() const
+{
+  return QLatin1String("QUIT - close the current connection");
+}