Lts/Services: finalize Qt6/C++17 migration cleanup

Remove deprecated Qt5 patterns remaining in Services:

- Replace remaining SIGNAL/SLOT string syntax with function pointer syntax
  (NmeaManagement/socket_handler.cpp, AudioVideoManagement/ModuleTests/mvs_tests.cpp)

- Remove Qt::UniqueConnection (deprecated in Qt6, default behavior) from
  19 files across AES, CES plugins, and cross-services (47 occurrences)

- Remove umbrella #include <QtCore> from fire_automaton.h and
  aes_test_fire_automaton.h (specific includes suffice)

25 files changed, 74 insertions(+), 81 deletions(-)

qt6-after/qt6-migrated-legatus/Lts/Services/AreaEffectSimulation/Utils/firing_timer.cpp

@@ -177,7 +177,7 @@ bool FiringTimer::init(long effectDurationMsec, int ammoCount, long ammoFlightDu
   d->m_firingTimer->setSingleShot(false);
   d->m_firingTimer->setInterval(d->m_intervallMsec);
   connect(d->m_firingTimer, &QTimer::timeout,
-          this, &FiringTimer::onFiringTimout, Qt::UniqueConnection);
+          this, &FiringTimer::onFiringTimout);
 
   TRACE_LOG(m_logger) << MY_LOGFUNCTION << " END";
   return true;
@@ -460,7 +460,7 @@ void FiringTimer::onFiringTimout()
     // : maybe use disconnect via QMetaObject
 
     connect(d->m_firingTimer, &QTimer::timeout,
-            this, &FiringTimer::onFiringTimoutExpiredPlus, Qt::UniqueConnection);
+            this, &FiringTimer::onFiringTimoutExpiredPlus);
 
     d->m_firingTimer->setSingleShot(true);
     d->m_firingTimer->start();