Qt6 Migration: BUILD_RTI guards und CMake fixes

- BUILD_RTI conditional compilation für RTI Connext DDS dependencies
- Namespace fixes in core_dtc.h (Core:: → DDS::Core::)
- CMakeLists.txt: BUILD_RTI option und conditional dependencies
- Handler minelayer: namespace closing mit BUILD_RTI guard
- Build erfolgreich mit BUILD_RTI=OFF validiert

Signed-off-by: Torsten Wierschin <torsten.wierschin@life-maps.com>

qt6-after/qt6-migrated-legatus/tests/test_event.cpp

@@ -37,7 +37,7 @@ TEST(EventTest, ConstructorInitializesMembers)
 
 TEST(EventTest, DurationCalculation)
 {
-    Event event(1, 2, 1000, 3000, 0, 0, 0, QStringList(), nullptr, QColor());
+    Event event(1, 2, 1000, 3000, 0, 0, 0, QStringList(), nullptr, QColor(), QJsonObject());
 
     qint64 duration = event.duration(true);
 
@@ -46,7 +46,7 @@ TEST(EventTest, DurationCalculation)
 
 TEST(EventTest, VisibilityToggle)
 {
-    Event event;
+    Event event(1, 2, 1000, 2000, 0, 0, 0, QStringList(), nullptr, QColor(), QJsonObject());
 
     EXPECT_TRUE(event.isVisible());