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/CentralEffectSimulation/ces_plugin_interface.h

@@ -0,0 +1,76 @@
+/**
+  * CES Plugin Interface
+  * $Id$
+  * $HeadURL$
+  * $Author$
+  * Created by Gerlinde Rudolphus, SLTE, 2016-04-14
+  */
+
+#pragma once
+
+#include <QObject>
+#include <QString>
+#include <memory>
+#include <unordered_map>
+#include <DDS/DDSConnector/dds_connector.h>
+#include <CentralEffectSimulation/ces_db.h>
+#include <ngldb/db_service_handler.h>
+
+namespace NGL
+{
+class Settings;
+}
+
+namespace NGLDB
+{
+template <typename DB> class DbServiceHandler;
+}
+
+namespace CentralEffectSimulation
+{
+using DbHandler = NGLDB::DbServiceHandler<DatabaseInterface>;
+
+class MainHandler;
+class DdsHandler;
+//class DbHandler;
+class DatabaseInterface;
+class HandlerParticipant;
+class HandlerBuildingData;
+namespace Plugin
+{
+
+class Interface;
+class DataProvider
+{
+public:
+  DataProvider() = default;
+  virtual ~DataProvider() = default;
+};
+
+class Plugin
+{
+public:
+  Plugin() = default;
+  virtual ~Plugin() = default;
+  virtual std::shared_ptr<Interface> createInterface(DataProvider *pdp,
+                                                     const std::shared_ptr<DDSConnector::DdsConnector> &dDSConnector,
+                                                     NGL::Settings *settings,
+                                                     MainHandler *mainHandler) = 0;
+};
+
+class Interface: public QObject
+{
+  Q_OBJECT
+public:
+  Interface() = default;
+  virtual ~Interface() = default;
+  virtual bool init(int domainId, int exerciseId) = 0;
+  virtual const char *name() const = 0;
+  virtual QString echo(const QString &message) = 0;
+};
+
+
+} // namespace Plugin
+} // namespace CentralEffectSimulation
+
+Q_DECLARE_INTERFACE(CentralEffectSimulation::Plugin::Plugin, "special:3:ces")