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/DDS/FTC/generic_ftc_threading.h

@@ -0,0 +1,98 @@
+#pragma once
+/**
+  * @RDE_HEADER@
+  * Thread management for generic FTCs
+  * $Id: generic_ftc_impl.h 62388 2024-03-27 10:41:26Z wille_m $
+  * $HeadURL: svn://slssvn/TDS/branches/product/features/swp_2023_devel/Lts/DDS/FTC/generic_ftc_impl.h $
+  * $Author: wille_m $
+  *
+  * Created by Mike Wille, ESZS, 27-03-2024
+  */
+
+#include <QObject>
+#include <QAtomicInt>
+#include <QTimer>
+
+#include <thread>
+#include <exception>
+#include <condition_variable>
+
+
+class CancelationPointReached : public std::runtime_error
+{
+public:
+  //using std::runtime_error::runtime_error;
+  explicit CancelationPointReached()
+    : std::runtime_error("CancelationPointReached")
+  {}
+};
+
+
+class Threading // : public QObject
+{
+  //Q_OBJECT
+public:
+  Threading() = default;
+  ~Threading();
+
+protected:
+  void preInit() const;
+
+  // managing thread:
+  void createThread(); // creates a thread if not already running - run before adding requests
+  void runThread(); // notify thread
+
+  // m_conditionMutex
+  inline bool isRun() const { return (m_run != 0); }
+  inline void setRun(bool run) { m_run = (run ? 1 : 0); }
+
+  // m_conditionMutex
+  inline void setWorkAvailable(bool workAvailable) { m_workAvailable = (workAvailable ? 1 : 0); }
+  inline bool isWorkAvailable() const { return (m_workAvailable != 0); }
+
+  // m_conditionMutex
+  inline void setWorking(bool working) { m_isWorking = (working ? 1 : 0); }  
+  inline bool isWorking() const { return (m_isWorking != 0); }
+
+  const QString &threadName() const;
+  inline const char *posixThreadName() const;
+
+  virtual void work() = 0;
+  virtual QString functionTopicName() const = 0;
+  virtual int partitionId() const = 0;
+  virtual QString partitionType() const = 0;
+  virtual void cleanupThread() = 0; // in-thread!
+  virtual void threadDone() = 0;
+
+  inline void cancellationPoint() const noexcept(false) // in-thread
+  {
+    if (!isRun())
+    {
+     // fprintf(stderr, "Threading: cancelation point reached\n");
+      throw CancelationPointReached();
+    }
+  }
+
+  std::mutex m_conditionMutex;
+
+private:
+  inline bool isCleanupNeeded() const { return (m_cleanupNeeded != 0); }
+  inline void setCleanupNeeded(bool cleanupNeeded) { m_cleanupNeeded = (cleanupNeeded ? 1 : 0); }
+  void run(const QString &threadName); // in-thread
+
+  //void stop();
+  std::unique_ptr<QTimer> m_threadLifetime;
+  QAtomicInt m_run { 0 };
+  QAtomicInt m_cleanupNeeded { 1 };
+  std::thread m_thread; // invalid / not a thread
+  std::condition_variable m_condition;
+  QAtomicInt m_workAvailable { 0 };
+  QAtomicInt m_isWorking { 0 };
+  mutable QString m_threadName;
+  mutable std::string m_posixThreadName;
+  QAtomicInt m_alreadyThreaded;
+  mutable int m_partitionId { -1 };
+  mutable QString m_partitionType;
+  bool m_used { false };
+  bool m_createThreadCalledBefore { false };
+};