Core/GameObjects: Transport (type 11) improvements

* Fully synchronize serverside animation progress with client
* Implemented updating passenger positions on elevators
* Removed visibility hack for elevators that always forced CreateObject packet to be sent to client

src/server/game/Entities/Unit/Unit.cpp

@@ -12581,7 +12581,7 @@ ObjectGuid Unit::GetTransGUID() const
     if (GetVehicle())
         return GetVehicleBase()->GetGUID();
     if (GetTransport())
-        return GetTransport()->GetGUID();
+        return GetTransport()->GetTransportGUID();
 
     return ObjectGuid::Empty;
 }
@@ -13539,7 +13539,7 @@ void Unit::_EnterVehicle(Vehicle* vehicle, int8 seatId, AuraApplication const* a
         SetControlled(true, UNIT_STATE_ROOT);
 
     ASSERT(!m_vehicle);
-    (void)vehicle->AddPassenger(this, seatId);
+    (void)vehicle->AddVehiclePassenger(this, seatId);
 }
 
 void Unit::ChangeSeat(int8 seatId, bool next)