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/Common/LtsCommandLineParser/LtsCommandLineParser.h

@@ -0,0 +1,60 @@
+/**
+ * @RDE_HEADER@
+ * $Id$
+ * $HeadURL$
+ * $Author$
+ */
+
+#pragma once
+
+#include <QCommandLineParser>
+#include <LtsCommandLineParser/ltscommandlineparser_export.h>
+
+class QUrl;
+namespace LtsCommandLineParser
+{
+class LTSCOMMANDLINEPARSER_EXPORT LtsCommandLineParser : public QCommandLineParser
+{
+public:
+  enum ProvideCommandLineParameterOptions
+  {
+    None = 0x0000,
+    CreateDomainIdFromIp = 0x0001,
+    DomainId = 0x0002,
+    ExerciseId = 0x0004,
+    CustomConfigFile = 0x0008,
+    TcpConnectionUrl = 0x0010,
+    NoVersion = 0x0020
+  };
+
+  explicit LtsCommandLineParser(ProvideCommandLineParameterOptions opts = ProvideCommandLineParameterOptions(CreateDomainIdFromIp|DomainId|ExerciseId|CustomConfigFile));
+  virtual ~LtsCommandLineParser() = default;
+  int domainId() const;
+  void setDomainId(int id);
+  int exerciseId() const { return m_exerciseId; }
+  QString iniFile() const { return m_iniFile; }
+  bool iniFileSet() const;
+  bool useTcpConnection() const;
+  QUrl tcpConnectionUrl() const;
+  virtual bool init(bool bParseHelp = true);
+
+  void showHelp(int exitCode = 0);
+  bool domainIdProvided() const;
+  bool exerciseIdProvided() const;
+
+  void setUnitModuleTestMode(bool onOff) { m_unitModuleTestMode = onOff; }
+
+protected:
+  QString m_additionalHelpStr;
+
+private:
+  QFlags<ProvideCommandLineParameterOptions> m_enabledOptions;
+  int     m_exerciseId{0};
+  int     m_domainId{0};
+  int     m_generatedDomainId{0};
+  bool    m_domainIdSetByFunction{false};
+  bool    m_unitModuleTestMode{false};
+  QString m_iniFile;
+};
+
+} // namespace Common