First move towards using the SimulationElement vector in GISASSimulation

Core/Algorithms/inc/DWBASimulation.h

Core/Algorithms/inc/DecoratedLayerDWBASimulation.h

Core/Algorithms/inc/GISASSimulation.h

Core/Algorithms/inc/LayerStrategyBuilder.h

Core/Algorithms/inc/MultiLayerDWBASimulation.h

Core/Algorithms/inc/Simulation.h

Core/Algorithms/inc/SimulationElement.h

Core/Algorithms/src/DWBASimulation.cpp

Core/Algorithms/src/DecoratedLayerDWBASimulation.cpp

Core/Algorithms/src/GISASSimulation.cpp

Core/Algorithms/src/LayerStrategyBuilder.cpp

Core/Algorithms/src/MultiLayerDWBASimulation.cpp

Core/Algorithms/src/MultiLayerRoughnessDWBASimulation.cpp

Core/Algorithms/src/Simulation.cpp

Core/Algorithms/src/SimulationElement.cpp

Core/PythonAPI/src/GISASSimulation.pypp.cpp

Core/PythonAPI/src/Simulation.pypp.cpp

Core/Tools/inc/OutputData.h

Tests/UnitTests/TestCore/DWBASimulationTest.h