Qt6 Migration: Merge latest Qt5 devel content and apply migration fixes

- Merged 292 changed files from dlbo snapshot
- Fixed IDL enum collisions (PortType, PdmEventType)
- Fixed Grantlee template for C++11 scoped enums
- Fixed CMake VERSION_GREATER syntax
- Added missing directories (THP, LtsRestClient, etc.)

Co-authored-by: Copilot <223556219+Copilot@users.noreply.github.com>

Lts/Tools/Examples/TestGuiElement/CMakeLists.txt

@@ -0,0 +1,31 @@
+cmake_minimum_required(VERSION 3.16)
+project(GuiElementPlugin CXX)
+
+set(CMAKE_AUTOMOC ON)
+
+
+SET(gui_element_SRCS
+  custom_widget.cpp
+  custom_widget.h
+  gui_element_plugin.cpp
+  gui_element_plugin.h
+)
+
+NGL_WRAP_UI(gui_element_SRCS
+  custom_widget.ui
+)
+
+NGL_ADD_LIBRARY(WS GuiElementPlugin MODULE ${gui_element_SRCS})
+# Pfad zum Interface-Ordner bekannt machen
+NGL_TARGET_INCLUDE_DIRECTORIES(GuiElementPlugin PRIVATE ${CMAKE_CURRENT_SOURCE_DIR}/..)
+
+NGL_TARGET_LINK_LIBRARIES(GuiElementPlugin
+   Qt5::Widgets
+   LtsWidgets
+   LtsSession
+   LtsSessionData
+   GuiElementInterface
+   PpmDataPluginInterface
+   PpmCommon
+   LtsCoordTrans
+ )