buildSample now returns MultiLayer* instead of ISample*

Core/Export/PythonFormatting.cpp

Core/Multilayer/ISampleBuilder.h

Core/Multilayer/LayerStrategyBuilder.cpp

Core/Multilayer/LayerStrategyBuilder.h

Core/Simulation/DWBASimulation.cpp

Core/Simulation/DWBASimulation.h

Core/Simulation/GISASSimulation.cpp

Core/Simulation/GISASSimulation.h

Core/Simulation/OffSpecSimulation.cpp

Core/Simulation/OffSpecSimulation.h

Core/Simulation/Simulation.cpp

Core/Simulation/Simulation.h

Core/StandardSamples/BoxCompositionBuilder.cpp

Core/StandardSamples/BoxCompositionBuilder.h

Core/StandardSamples/CoreShellParticleBuilder.cpp

Core/StandardSamples/CoreShellParticleBuilder.h

Core/StandardSamples/CustomMorphologyBuilder.cpp

Core/StandardSamples/CustomMorphologyBuilder.h

Core/StandardSamples/CylindersAndPrismsBuilder.cpp

Core/StandardSamples/CylindersAndPrismsBuilder.h