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/include/leaflet-1.7.1/gpx/package.json

@@ -0,0 +1,26 @@
+{
+  "name": "leaflet-gpx",
+  "version": "1.5.0",
+  "description": "A Leaflet plugin for showing a GPX track on a map",
+  "main": "gpx.js",
+  "scripts": {
+    "test": "echo \"Error: no test specified\" && exit 1"
+  },
+  "repository": {
+    "type": "git",
+    "url": "git+https://github.com/mpetazzoni/leaflet-gpx.git"
+  },
+  "keywords": [
+    "leaflet",
+    "gpx",
+    "leaflet-gpx",
+    "map",
+    "gps"
+  ],
+  "author": "Maxime Petazzoni <maxime.petazzoni@bulix.org> (https://www.bulix.org)",
+  "license": "BSD-2-Clause",
+  "bugs": {
+    "url": "https://github.com/mpetazzoni/leaflet-gpx/issues"
+  },
+  "homepage": "https://github.com/mpetazzoni/leaflet-gpx#readme"
+}