move py generation to the relevant classes

Core/Export/PyFmt2.cpp

Core/Export/PyFmt2.h

Core/Export/SampleToPython.cpp

Param/Distrib/Distributions.cpp

Param/Distrib/Distributions.h

Sample/Correlations/FTDecay1D.cpp

Sample/Correlations/FTDecay1D.h

Sample/Correlations/FTDecay2D.cpp

Sample/Correlations/FTDecay2D.h

Sample/Correlations/FTDistributions1D.cpp

Sample/Correlations/FTDistributions1D.h

Sample/Correlations/FTDistributions2D.cpp

Sample/Correlations/FTDistributions2D.h

Sample/Scattering/IFormFactor.cpp

Sample/Scattering/IFormFactor.h

Sample/Slice/LayerRoughness.cpp

Sample/Slice/LayerRoughness.h