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/Tools/SqlBrowser/main.cpp

@@ -0,0 +1,56 @@
+// needed: libQt5Sql5-postgresql
+
+/* TODO:
+ *
+ * hint for custom queries and their 'editibility'
+ * autocompletion of tablenames (& columns?)
+ * csv export for iuliana
+ * to insert something, DataModel must use QVariant as data storage !
+ *
+ */
+
+#include "BrowserWnd.h"
+
+#include <nglapplication/nglapplication.h>
+#include <QDebug>
+#include <QTimer>
+
+
+int main(int argc, char** argv)
+{
+  QStringList params;
+  params << QStringLiteral("--darkStyle");
+
+  int setDarkStyle = false;
+
+  for (int i = 0; i < argc; i++)
+  {
+    switch (params.indexOf(QString::fromUtf8(argv[i])))
+    {
+      case 0: // darkStyle
+      {
+        setDarkStyle = true;
+        break;
+      }
+    }
+  }
+
+  if (setDarkStyle)
+  {
+    qunsetenv("TDS_DEVEL"); // no dark style
+  }
+  else
+  {
+    qputenv("TDS_DEVEL", "1");
+  }
+
+
+
+  NGLApplication a(argc, argv);
+  a.createLogger("SQLBrowser", "log4cxx_sqlbrowser.props");
+
+  BrowserWnd   browserWnd;
+  QTimer::singleShot(0, &browserWnd, &BrowserWnd::startConnect);
+
+  return a.exec();
+}