Merge feature/lts-viewer-validation-testing-phase into feature/qt6-migration-basis-modules-merge

Resolves 1 conflict (new_docker_build.sh, union of viewer-only + codification options); folds in fixes for pre-existing defects surfaced by the validation runs (KDReports-qt6 wiring, LtsSession RTI linking, LtsFileDialog/WLS/BSM Qt6/RTI API migration, GROUP4 target list, new --cmake_build_flags option); validated with BUILD_RTI=ON BUILD_GRANTLEE=ON in 3 Docker runs (run 3: build green, 6 base-state first-run CTest failures documented).

qt6-after/qt6-migrated-legatus/Lts/Proxies/Buildings/BuildingControlUnit/BSM/bsm_socket.cpp

@@ -6,6 +6,7 @@
 #include "bsm_telegrams_configuration_setup.h"
 #include <QtCore/QTimer>
 #include <QtNetwork/QHostAddress>
+#include <TrainingAreaBase/logger.h>
 
 static const int s_aliveTimeout = 10;  
 namespace BuildingControlUnit