Qt6 Migration: Complete migration with DDS/RTI support and build validation

Major Changes:
- Merged latest Qt5 devel content from dlbo (292 files changed, 7 new dirs)
- Consolidated forward-declarations and include folders
- Removed unneeded modules per Niklas' repo check list

Build System Fixes:
- Fixed CMake VERSION_GREATER syntax in ParticipantManagement/CMakeLists.txt
- Added VLC packages (libvlc-dev, vlc-plugin-base) to docker_build.sh
- Added PostgreSQL dev packages (libpq-dev, postgresql-server-dev-all) to Dockerfile
- Fixed locale warnings (ANSI_X3.4-1968 → C.UTF-8)
- Fixed ArcGIS SDK path warnings when BUILD_ARCGIS=OFF

Code Generation Fixes:
- Fixed IDL enum collisions (PortType→CorePortType/DdsutPortType, PdmEventType)
- Fixed Grantlee template svc_translation.cpp.grantlee:
  - Changed {{ idl_enum.name }}_def:: to {{ idl_enum.name }}::
  - Fixed .underlying() calls for C++11 scoped enums (enum class)
- Removed generated files from repo (moc_*, *_dtc.h, *_ftc.h)

Validation:
- BUILD_RTI=ON: SUCCESS
- BUILD_RTI=OFF: SUCCESS
- C++17 standard maintained for RTI 7.7 compatibility
- Ubuntu 26.04 Docker environment verified

Remaining Warnings (expected):
- BgViewer, KDChart, KDReports, Poppler-Qt6 not found (optional features)

Co-authored-by: Copilot <223556219+Copilot@users.noreply.github.com>

qt5-before/dlbo/Lts/Services/AudioVideoManagement/AvsCommands/simple_command.h

@@ -0,0 +1,74 @@
+/**
+  * @RDE_HEADER@
+  * SimpleCommand
+  * $Id$
+  * $HeadURL$
+  * $Author$
+  * Created by Christian Fröbel, SLSE, 2017-07-11
+  */
+
+#pragma once
+
+#include "icommand.h"
+#include <functional>
+
+namespace AudioVideoManagement
+{
+
+class IAvaComm;
+class IAvaCommandDoneObserver;
+class IVdComm;
+class IVdCommandDoneObserver;
+
+namespace detail
+{
+
+/**
+ * A SimpleCommand synchronises only with the OK response sent by the AVS.
+ * In order to invoke the actual command, a function object needs to be supplied
+ * which then calls the corresponding method on AvaComm or VdComm.
+ *
+ * @author Christian Fröbel
+ */
+template<class Comm, class DoneObserver>
+class SimpleCommand : public ICommand
+{
+public:
+  /**
+   * The AVS responds to some commands with more than one OK. In that case
+   * the number of expected OK-responses can be specified.
+   */
+  SimpleCommand(const QString &commandDesc, Comm *comm, DoneObserver *observer, std::function<void (Comm *)> commandInvoker, int okCount = 1);
+  QString debug() const override { return m_commandDesc; }
+
+  void send() override;
+
+private slots:
+  void onOk();
+
+private:
+  void done();
+
+  std::function<void (Comm *)>   m_commandInvoker;
+  const int                      m_expectedOkCount;
+  int                            m_okCount{0};
+  Comm                          *m_comm;
+  DoneObserver                  *m_observer;
+  QString                        m_commandDesc;
+};
+
+} // namespace detail
+
+
+namespace AvaCommands
+{
+using SimpleCommand = detail::SimpleCommand<IAvaComm, IAvaCommandDoneObserver>;
+}
+
+
+namespace VdCommands
+{
+using SimpleCommand = detail::SimpleCommand<IVdComm, IVdCommandDoneObserver>;
+}
+
+} // namespace AudioVideoManagement