Resolve warnings from clang-tidy

GUI/Model/Sample/LayerItem.cpp

GUI/Model/Sample/SampleValidator.cpp

GUI/Model/To/DomainObjectBuilder.cpp

GUI/Model/To/DomainObjectBuilder.h

GUI/Model/Types/DoubleDescriptor.cpp

GUI/Model/Types/DoubleDescriptor.h

GUI/View/Fit/MinimizerSettingsWidget.cpp

GUI/View/Fit/SliderSettingsWidget.cpp

GUI/View/Mask/MaskEditorPropertyPanel.cpp

GUI/View/Mask/MaskEditorPropertyPanel.h

GUI/View/Projection/ProjectionsEditor.cpp

GUI/View/PropertyEditor/IntensityDataPropertyWidget.cpp

GUI/View/PropertyEditor/SpecularDataPropertyWidget.cpp

GUI/View/Realspace/RealSpaceBuilder.cpp

GUI/View/Realspace/RealSpaceMesoCrystalUtils.cpp

GUI/View/SampleDesigner/InterferenceForm.cpp

auto/Wrap/doxygenParam.i

auto/Wrap/doxygenSample.i

auto/Wrap/libBornAgainSample.py

auto/Wrap/libBornAgainSample_wrap.cpp