Complete Qt6 migration: full clean build green across groups G1-G12 incl. runtime plugin set

new_docker_build.sh gains Group 12 (212 GUI/Data plugins); fixes LtsUtilsGuiDds visibility (LTO-stripped exports), LtsProjectionWorkstation unity name shadow, 6 unity-off dirs (dup file-scope statics, ddsftc INTERFACE sources) and reconfigures BUILD_FILTERMANAGEMENT/BUILD_PLUGINS_SERVICEMONITOR=ON

qt6-after/qt6-migrated-legatus/Lts/Services/ExerciseManagement/handler_exercise.cpp

@@ -175,7 +175,7 @@ static Database::ExmExercise copyBaseData(const T &in)
   newData.startTime        = QDateTime::fromMSecsSinceEpoch(in.startTime);
   newData.stopTime         = QDateTime::fromMSecsSinceEpoch(in.stopTime);
   newData.trainingAreaId   = in.trainingAreaId;
-  if (in.radioGroupId.is_set())
+  if (in.radioGroupId.has_value())
     newData.radioGroupId     = in.radioGroupId.get();
   newData.symbolFillTypeId = in.symbolFillTypeId;
   newData.linkedExerciseId = in.linkedExerciseId;
@@ -693,7 +693,7 @@ bool HandlerExercise::checkEquipmentNumbersOnAllExercises(int exerciseIdToBeStar
 
     const auto cb = [&eqNoForEx](const ParticipantManagement::Participant &data) -> void
     {
-      if (data.equipmentNumber.is_set())
+      if (data.equipmentNumber.has_value())
         eqNoForEx.insert(data.equipmentNumber.get());
     };
     ppmDtcForEx->participants(cb);
@@ -793,7 +793,7 @@ QStringList HandlerExercise::doubleChannels(int exerciseAId, int exerciseBId) co
 
   for (auto it = cnrConfigs.constBegin(); it != cnrConfigs.constEnd(); ++it)
   {
-    int cnrExerciseId = it.value().exerciseId.is_set() ? it.value().exerciseId.get() : 0;
+    int cnrExerciseId = it.value().exerciseId.has_value() ? it.value().exerciseId.get() : 0;
 
     if (cnrExerciseId == exerciseAId)
     {