Standard include guards

Base/Py/PyUtils.h

Core/Residual/ChiSquaredModule.h

Core/Residual/IChiSquaredModule.h

Core/Residual/IIntensityFunction.h

Core/Residual/VarianceFunctions.h

Device/Data/ArrayUtils.h

Sample/LegacyRT/MatrixRTCoefficients_v1.h

Sample/LegacyRT/MatrixRTCoefficients_v2.h

Sample/LegacyRT/SpecularMagneticStrategy_v1.h

Sample/LegacyRT/SpecularMagneticStrategy_v2.h

Tests/UnitTests/gui2/libtestmachinery/folderbasedtest.h

Tests/UnitTests/gui2/libtestmachinery/google_test.h

Tests/UnitTests/gui2/libtestmachinery/test_utils.h

Tests/UnitTests/gui2/libtestmachinery/widgetbasedtest.h

gui2/core/app_constants.h

gui2/core/version.h

gui2/dataloader/datahandler.h

gui2/dataloader/dataloader_constants.h

gui2/dataloader/dataloader_types.h

gui2/dataloader/dataloader_utils.h