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/LtsCoordTrans/mgrs2lonlat.cpp

@@ -0,0 +1,49 @@
+/**
+  * Convert a lon/lat coordinate to mgrs
+  * $Id$
+  * $HeadURL$
+  * $Author$
+  */
+
+#include <GeographicLib/UTMUPS.hpp>
+#include <GeographicLib/MGRS.hpp>
+#include <string>
+
+int main(int argc, char **argv)
+{
+  if (argc != 2)
+  {
+    fprintf(stderr, "Usage: %s <mgrs>\n", argv[0]);
+    return -1;
+  }
+
+  std::string mgrs = argv[1];
+  mgrs.erase(remove_if(mgrs.begin(), mgrs.end(), isspace), mgrs.end());
+
+  int prec;
+  double lonDeg, latDeg;
+  try
+  {
+    int zone;
+    bool northp;
+    double x, y;
+    GeographicLib::MGRS::Reverse(mgrs, zone, northp, x, y, prec, true);
+    GeographicLib::UTMUPS::Reverse(zone, northp, x, y, latDeg, lonDeg);
+
+    GeographicLib::UTMUPS::Forward(latDeg, lonDeg, zone, northp, x, y);
+    GeographicLib::MGRS::Forward(zone, northp, x, y, prec, mgrs);
+  }
+  catch (...)
+  {
+    fprintf(stderr, "Error converting %s to Lon/Lat coords\n", mgrs.c_str());
+    return -2;
+  }
+  std::string part1, part2, part3, part4;
+  part1 = mgrs.substr(0, 3);
+  part2 = mgrs.substr(3, 2);
+  part3 = mgrs.substr(5, prec);
+  part4 = mgrs.substr(5 + prec, prec);
+  fprintf(stdout, "%s %s %s %s = %13.10f, %13.10f ( %13.10f, %13.10f )\n",
+          part1.c_str(), part2.c_str(), part3.c_str(), part4.c_str(), lonDeg, latDeg, lonDeg / 180. * M_PI, latDeg / 180. * M_PI);
+  return 0;
+}