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/EvalApps/Viewshed3D/LocationViewshed.pro

@@ -0,0 +1,58 @@
+#-------------------------------------------------
+# Copyright 2015 Esri.
+
+# Licensed under the Apache License, Version 2.0 (the "License");
+# you may not use this file except in compliance with the License.
+# You may obtain a copy of the License at:
+# http://www.apache.org/licenses/LICENSE-2.0
+
+# Unless required by applicable law or agreed to in writing, software
+# distributed under the License is distributed on an "AS IS" BASIS,
+# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+# See the License for the specific language governing permissions and
+# limitations under the License.
+#-------------------------------------------------
+
+mac {
+    cache()
+}
+
+CONFIG += c++11 esri_runtime_qt100_0_0 debug
+
+QT += core gui opengl xml network positioning sensors
+
+win32:CONFIG += \
+  embed_manifest_exe
+
+TARGET = LocationViewshed
+TEMPLATE = app
+
+SOURCES += \
+    main.cpp \
+    ViewshedLocation.cpp
+
+HEADERS  += \
+    ViewshedLocation.h
+
+
+win32 {
+  INCLUDEPATH     += "C:/Program Files (x86)/ArcGIS SDKs/Qt100.0/sdk/include"
+  debug:LIBPATH   += "C:/Program Files (x86)/ArcGIS SDKs/Qt100.0/sdk/windows/x64/lib/Debug"
+  release:LIBPATH += "C:/Program Files (x86)/ArcGIS SDKs/Qt100.0/sdk/windows/x64/lib/Release"
+  debug:LIBS      += -lEsriCommonQtd
+  release:LIBS    += -lEsriCommonQt
+  debug:LIBS      += -lEsriRuntimeQtd
+  release:LIBS    += -lEsriRuntimeQt
+}
+
+linux {
+  INCLUDEPATH += /usr/include/arcgis
+  LIBS        += -lEsriCommonQt
+  LIBS        += -lEsriRuntimeQt
+  LIBS        += -lc++
+}
+
+
+macx {
+    QMAKE_MACOSX_DEPLOYMENT_TARGET = 10.11
+}