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/ExerciseEventManagement/handler_participant_event.cpp

@@ -90,7 +90,7 @@ void HandlerParticipantEvent::onAesItemViewChanged(const AreaEffectSimulation::A
   Database::EemEvent eData = m_aesMap[data.id];
   eData.sampleTime = data.effectStart;
 
-  if (data.partyId.is_set())
+  if (data.partyId.has_value())
     eData.partyId = data.partyId.get();
 
   switch(modType)
@@ -242,13 +242,13 @@ void HandlerParticipantEvent::onExplosionSingleChanged(const AreaEffectSimulatio
 {
 
   Database::EemEvent eData = m_aesMap[data.id];
-  if ( !data.effectStart.is_set())
+  if ( !data.effectStart.has_value())
   {
     return;
   }
   eData.sampleTime = data.effectStart.get();
 
-  if (data.partyId.is_set())
+  if (data.partyId.has_value())
     eData.partyId = data.partyId.get();
 
   switch(modType)