completed removal of inline 'class' declarations

Core/Multilayer/IFormFactor.h

Core/Multilayer/ISampleBuilder.h

Core/Multilayer/Layer.h

Core/Multilayer/LayerSpecularInfo.cpp

Core/Multilayer/LayerSpecularInfo.h

Core/Multilayer/LayerStrategyBuilder.cpp

Core/Multilayer/LayerStrategyBuilder.h

Core/Multilayer/ScalarSpecularInfoMap.h

Core/Simulation/MultiLayerDWBASimulation.cpp

Core/Simulation/MultiLayerDWBASimulation.h

Core/Simulation/MultiLayerRoughnessDWBASimulation.cpp

Core/Simulation/MultiLayerRoughnessDWBASimulation.h

Core/TestMachinery/FunctionalTestSuite.h

auto/Wrap/doxygen_core.i

auto/Wrap/libBornAgainCore.py

auto/Wrap/libBornAgainCore_wrap.cpp