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/Viewer/SituationMap/Tests/SitMapTestApp/main.cpp

@@ -0,0 +1,68 @@
+/**
+  * @RDE_HEADER@
+  * SquishTest
+  * $Id$
+  * $HeadURL$
+  * $Author$
+  */
+
+#include <nglapplication/nglapplication.h>
+#include <NGLLogger/INGLLogger.h>
+
+#include "mainwindow.h"
+
+#include <QDesktopWidget>
+#include <QMessageBox>
+
+// -------------------------------------------------------------------
+int main (int argc, char* argv[])
+{
+    NGLApplication app ( argc, argv );
+
+    // under windows for ArcGIS 10.2.6 and higher
+#ifdef Q_OS_WIN
+    QCoreApplication::setAttribute( Qt::AA_UseOpenGLES );
+#endif
+
+    app.createLogger("sitMapTestApp", "log4cxx_sitMapTestApp.props");
+    TRACE_LOG(app.baseLogger()) << LOGFUNCTION << " START";
+
+    STARTUP_LOG(app.baseLogger());
+
+    app.setOrganizationName(QLatin1String("Rheinmetall Defence Electronics"));
+    app.setApplicationName(QLatin1String("Situation Map Test Application"));
+
+    MainWindow *mw = new MainWindow();
+/*
+    QDesktopWidget *desktopWidget = QApplication::desktop();
+    QRect geom;
+
+//    DEBUG_LOG(app.baseLogger()) << LOGFUNCTION << " desktopWidget->screenCount() = " << desktopWidget->screenCount();
+
+    if (desktopWidget->screenCount() > 1)
+      geom = desktopWidget->screenGeometry(1);
+    else
+      geom = desktopWidget->screenGeometry();
+
+    int width = mw->frameGeometry().width();
+    int height = mw->frameGeometry().height();
+    int screenWidth = geom.width();
+    int screenHeight = geom.height();
+    int screenWidth = 1024;
+    int screenHeight = 768;
+    mw->setGeometry((screenWidth/2)-(width/2),(screenHeight/2)-(height/2),width,height);
+*/
+    mw->setGeometry(0,0,1024,768);
+//    mw->setWindowState(Qt::WindowMaximized);
+    mw->show();
+
+    app.setQuitOnLastWindowClosed(true);
+
+    int retval = app.exec();
+
+    delete mw;
+
+    SHUTDOWN_LOG(app.baseLogger());
+
+    return retval;
+}