Adds initial intermediate qt6 porting state

qt6-after/qt6-migrated-legatus/Lts/Proxies/TrainingAreaBaseOC/connection_handler.h

@@ -0,0 +1,26 @@
+
+
+
+#pragma once
+
+#include "connection_handler_tcp.h"
+#include "connection_handler_tcp_ttci.h"
+#include "connection_handler_serial.h"
+
+
+
+namespace TrainingAreaBaseOC
+{
+#ifdef GUEZ_MODE
+class ConnectionHandler : public ConnectionHandlerSerial
+#else
+class ConnectionHandler : public ConnectionHandlerTcpTtci
+#endif
+{
+  Q_OBJECT
+
+public:
+  explicit ConnectionHandler();
+};
+
+}