Merge branch 'if_strategies' into develop

Core/Algorithms/inc/DecouplingApproximationStrategy.h

Core/Algorithms/inc/IInterferenceFunctionStrategy.h

Core/Algorithms/inc/IsGISAXSMorphologyFileStrategy.h

Core/Algorithms/inc/LocalMonodisperseApproximationStrategy.h

...orithms/inc/SizeSpacingCorrelationApproximationStrategy.h

Core/Algorithms/src/DecouplingApproximationStrategy.cpp

Core/Algorithms/src/IInterferenceFunctionStrategy.cpp

Core/Algorithms/src/IsGISAXSMorphologyFileStrategy.cpp

...Algorithms/src/LocalMonodisperseApproximationStrategy.cpp

...ithms/src/SizeSpacingCorrelationApproximationStrategy.cpp

Core/Core.pro

Core/FormFactors/inc/IFormFactorBorn.h

Core/Samples/inc/ParticleDecoration.h

Core/Tools/inc/MathFunctions.h