Rename FormFactorWrapper to FormFactorCoherentSum

Core/Aggregate/FormFactorCoherentSum.cpp

Core/Aggregate/FormFactorCoherentSum.h

Core/Multilayer/DecouplingApproximationStrategy.cpp

Core/Multilayer/IInterferenceFunctionStrategy.cpp

Core/Multilayer/IInterferenceFunctionStrategy.h

Core/Multilayer/LayerStrategyBuilder.cpp

Core/Multilayer/LayerStrategyBuilder.h

Core/Multilayer/SSCApproximationStrategy.cpp

Tests/UnitTests/Core/Sample/FormFactorCoherentSumTest.h

Tests/UnitTests/Core/Sample/testlist.h

auto/Wrap/doxygen_core.i