Qt6 Migration: LtsWidgets, BUILD_RTI Guards, externe Dependencies dokumentiert

- LtsWidgets Verzeichnis vollständig migriert (Qt5→Qt6)
- BUILD_RTI Guards für RTI-spezifische Module hinzugefügt
- Externe Dependencies in EXTERNAL_DEPS.md dokumentiert
- Qt6 API-Änderungen: QRegExp→QRegularExpression, enterEvent(QEnterEvent*)
- AutoUic-Fehler bei ui_requirement behoben (SKIP_AUTOUIC)
- Include-Pfade korrigiert (LtsElevation, LtsMultiMonitor, LtsUtilsCore)
- MOC-Fehler behoben (Q_INTERFACES entfernt wo nicht benötigt)
- CMakeLists.txt Anpassungen für Qt6 (PUBLIC statt INTERFACE)

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

qt6-after/qt6-migrated-legatus/Lts/Common/LtsMultiMonitor/CMakeLists.txt

@@ -33,12 +33,7 @@ NGL_ADD_LIBRARY2(WS LtsMultiMonitor SHARED ${LtsMultiMonitor_SRCS})
 NGL_TARGET_INCLUDE_DIRECTORIES(LtsMultiMonitor
   PUBLIC
     ${CMAKE_CURRENT_SOURCE_DIR}/../
-)
-
-NGL_TARGET_INCLUDE_DIRECTORIES(LtsMultiMonitor
-  PUBLIC
-    ${CMAKE_CURRENT_SOURCE_DIR}/../
-    ${PROJECT_SOURCE_DIR}/include/LtsUtilsGuiDds
+    ${CMAKE_SOURCE_DIR}/Lts/Common/LtsUtils
 )
 
 NGL_TARGET_LINK_LIBRARIES(LtsMultiMonitor