fix guards and headers

Core/Correlations/FTDecay1D.h

Core/Correlations/FTDecay2D.h

Core/Correlations/FTDistributions1D.h

Core/Correlations/FTDistributions2D.h

Core/Correlations/IDistribution1DSampler.h

Core/Correlations/IDistribution2DSampler.h

Core/Correlations/ILayout.h

Core/Correlations/IPeakShape.h

Core/Export/OrderedMap.h

Core/HardParticle/FormFactorCosineRipple.h

Core/HardParticle/FormFactorSawtoothRipple.h

Core/HardParticle/IProfileRipple.h

Core/Multilayer/SpecularSimulationElement.h

Core/Parametrization/Distributions.cpp

Core/RT/ILayerRTCoefficients.h

Core/RT/MatrixRTCoefficients.h

Core/RT/MatrixRTCoefficients_v2.h

Core/RT/ScalarRTCoefficients.h

Core/Simulation/SimulationFactory.h

Core/Simulation/StandardSimulations.h