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/Plugins/skeleton/generate_plugin_base.py

@@ -0,0 +1,69 @@
+#!/usr/bin/python
+
+import os
+import sys
+import shutil
+import fileinput
+
+#######################
+###### FUNCTIONS ######
+#######################
+
+def copyAndReplaceInFile(sourceFile, destinationFile, replacements):
+  with open(sourceFile) as inFile, open(destinationFile, "w") as outFile:
+    for line in inFile:
+      for before, after in replacements.iteritems():
+        line = line.replace(before, after)
+      outFile.write(line)
+  
+##########################
+###### SCRIPT START ######
+##########################
+
+longName = raw_input("Enter Plugin name (in CamelCase): ")
+shortNameAllLow = raw_input("Enter Plugin abbreviation (3 lower case letters): ")
+shortNameCapital = shortNameAllLow.capitalize()
+shortNameAllUpper = shortNameAllLow.upper()
+
+#create new directory
+dirName = "../" + longName
+print "Trying to create Plugin directory \"" + dirName + "\""
+if os.path.isdir(dirName):
+  print "Directory \"" + dirName + "\" already exists. Exit"
+  sys.exit(-1)
+else:
+  os.mkdir(dirName)
+  print ".. done"
+
+#create new files to new dir
+print "Creating new files"
+replacements = { "skl":shortNameAllLow, "Skl":shortNameCapital, "SKL":shortNameAllUpper, "Skeleton":longName }
+copyAndReplaceInFile("base/CMakeLists.txt", "../" + longName + "/CMakeLists.txt", replacements)
+copyAndReplaceInFile("base/skl_data_plugin_interface.h", "../" + longName + "/" + shortNameAllLow + "_data_plugin_interface.h", replacements)
+print ".. done"
+
+#adding in CMakeLists.txt
+cmakeFileName = "../CMakeLists.txt"
+print "Trying to add directory in", cmakeFileName
+cmakeFileObject = open(cmakeFileName)
+lines = cmakeFileObject.readlines()
+cmakeFileObject.close
+index = 0
+hasAddedSubDir = False
+beforeLine = "placeholder"
+for line in lines:
+  if beforeLine.startswith("ADD_SUBDIRECTORY") and not line.startswith("ADD_SUBDIRECTORY"):
+    hasAddedSubDir = True
+    break
+  beforeLine = line
+  index += 1
+if hasAddedSubDir == True:
+  lines.insert(index, "ADD_SUBDIRECTORY(" + longName + ")\n")
+  cmakeFileObject = open(cmakeFileName, "w")
+  for line in lines:
+    cmakeFileObject.write(line)
+  cmakeFileObject.close()
+  print ".. done"
+else:
+  print "Could not add sub directory, please add \"ADD_SUBDIRECTORY(" + longName + ")\""
+  print "manually to", cmakeFileName