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/LtsUtils/LtsUtilsCore/CMakeLists.txt

@@ -19,8 +19,8 @@ SET(SRCS_hdr_only
 ADD_LIBRARY(LtsUtilsCoreHeaderOnly INTERFACE)
 TARGET_INCLUDE_DIRECTORIES(LtsUtilsCoreHeaderOnly
   INTERFACE
-    ${CMAKE_CURRENT_SOURCE_DIR}/..
-    ${CMAKE_CURRENT_BINARY_DIR}/..
+    ${CMAKE_CURRENT_SOURCE_DIR}/../..
+    ${CMAKE_CURRENT_BINARY_DIR}/../..
 )
 TARGET_SOURCES(LtsUtilsCoreHeaderOnly INTERFACE ${SRCS_hdr_only})
 
@@ -39,8 +39,8 @@ SET(SRCS
 NGL_ADD_LIBRARY2(ALL LtsUtilsCore SHARED ${SRCS})
 NGL_TARGET_INCLUDE_DIRECTORIES(LtsUtilsCore
   PUBLIC
-    ${CMAKE_CURRENT_SOURCE_DIR}/..
-    ${CMAKE_CURRENT_BINARY_DIR}/..
+    ${CMAKE_CURRENT_SOURCE_DIR}/../..
+    ${CMAKE_CURRENT_BINARY_DIR}/../..
 )
 NGL_TARGET_LINK_LIBRARIES(LtsUtilsCore
   PUBLIC