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/cmake/MacroEnsureOutOfSourceBuild.cmake

@@ -0,0 +1,21 @@
+# - MACRO_ENSURE_OUT_OF_SOURCE_BUILD(<errorMessage>)
+# MACRO_ENSURE_OUT_OF_SOURCE_BUILD(<errorMessage>)
+#    Call this macro in your project if you want to enforce out-of-source builds.
+#    If an in-source build is detected, it will abort with the given error message.
+#    This macro works in any of the CMakeLists.txt of your project, but the recommended
+#    location to call this is close to the beginning of the top level CMakeLists.txt
+
+# Copyright (c) 2006, Alexander Neundorf, <neundorf@kde.org>
+#
+# Redistribution and use is allowed according to the terms of the BSD license.
+# For details see the accompanying COPYING-CMAKE-SCRIPTS file.
+
+MACRO (MACRO_ENSURE_OUT_OF_SOURCE_BUILD _errorMessage)
+
+   STRING(COMPARE EQUAL "${CMAKE_SOURCE_DIR}" "${CMAKE_BINARY_DIR}" insource)
+   IF(insource)
+      MESSAGE(FATAL_ERROR "${_errorMessage}")
+   ENDIF(insource)
+
+ENDMACRO (MACRO_ENSURE_OUT_OF_SOURCE_BUILD)
+