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/ExerciseManagement/UnitTests/initialisation.h

@@ -0,0 +1,54 @@
+/**
+  * @RDE_HEADER@
+  * Unit test for DataTopic Server & Client (DTS & DTC)
+  * $Id$
+  * $HeadURL$
+  * $Author$
+  * Created by Hanna E. Rathje, SLSE, 2015-07-24
+  */
+
+#include <DDS/Generic/generic_base.h>
+#include <DDS/DTC/dtc_subscriber_listener.h>
+
+namespace NGL {
+  class INGLLogger;
+}
+
+class Initialisation
+{
+public:
+  Initialisation();
+  virtual ~Initialisation();
+
+  enum PubSub
+  {
+    USE_PUBLISHER  = 1,
+    USE_SUBSCRIBER = 2,
+    USE_PUB_SUB    = 4
+  };
+
+  // Initialisation
+  bool initDDS(int domainId, int partitionId,  PubSub pubsub = USE_PUBLISHER);
+  void cleanupSubscriberListener();
+
+  dds::domain::DomainParticipant getDomainParticipant()    { return m_domainParticipant; }
+  dds::domain::DomainParticipant getDomainParticipantSub() { return m_domainParticipantSub != nullptr ? m_domainParticipantSub : m_domainParticipant; }
+  dds::pub::Publisher            getDDSPublisher()         { return m_ddsPublisher; }
+  dds::sub::Subscriber           getDDSSubscriber()        { return m_ddsSubscriber; }
+  DTC::SubscriberListener       *getSubscriberListener()   { return m_subListener; }
+
+private:
+  dds::domain::DomainParticipant m_domainParticipant;
+  dds::domain::DomainParticipant m_domainParticipantSub;
+  int                            m_domainId;
+  int                            m_partitionId;
+  dds::pub::Publisher            m_ddsPublisher;
+  dds::sub::Subscriber           m_ddsSubscriber;
+
+  DTC::SubscriberListener       *m_subListener;
+
+  NGL::INGLLogger               &m_logger;
+};
+
+
+