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/start_script.h

@@ -0,0 +1,67 @@
+/**
+  * @RDE_HEADER@
+  * StartScript
+  * $Id$
+  * $HeadURL$
+  * $Author$
+  * Created by Astrid Müller, SGAS, 2018-02-14
+  */
+
+#pragma once
+
+#include "icommand.h"
+#include <AudioVideoManagement/ava_types.h>
+#include <QString>
+#include <boost/optional.hpp>
+
+namespace AudioVideoManagement
+{
+
+class IAvaComm;
+class IAvaCommandDoneObserver;
+
+namespace AvaCommands
+{
+
+/**
+ * The response to StartScript depends on whether a script is started
+ * or not.
+ * The response to the actual StartScript contains
+ *  a ScriptState.
+ * @author Hanna E. Rathje
+ */
+class StartScript final : public ICommand
+{
+  Q_OBJECT
+
+public:
+  StartScript(IAvaComm *comm, IAvaCommandDoneObserver *doneObserver, const QString &dialogId, const QString &scriptName, bool bBlocking);
+
+  void send() override;
+  QString debug() const override { return QLatin1String("StartScript"); }
+
+  /**
+   * May only be called after the command has successfully completed.
+   */
+  ///{@
+  AvaStreamState scriptState() const { return *m_scriptState; }
+  ///@}
+
+private slots: 
+  void onScriptStateReceived(const QString &dialogId, const QString &scriptName, AvaStreamState scriptState);
+  void onScriptPositionReceived(const QString &dialogId, const QString &scriptName, const QString &streamName, AvaTimePoint pos, AvaTimePoint relPos);
+
+private:
+  void done();
+
+  const QString                      m_dialogId;
+  const QString                      m_scriptName;
+  boost::optional<AvaStreamState>    m_scriptState;
+  IAvaComm                          *m_comm;
+  IAvaCommandDoneObserver           *m_observer;
+  bool                               m_bBlocking;
+};
+
+}
+} // namespace AudioVideoManagement::AvaCommands
+