corr @brief, fwd decl

GUI/View/Data/IntensityDataPropertyWidget.cpp

GUI/View/Device/AxisPropertyForm.cpp

GUI/View/FitControl/FitObjectiveBuilder.cpp

GUI/View/FitControl/MinimizerSettingsWidget.cpp

GUI/View/Info/MessageBox.cpp

GUI/View/Info/MessageBox.h

GUI/View/Info/PythonSyntaxHighlighter.cpp

GUI/View/Instrument/DistributionEditor.cpp

GUI/View/Instrument/DistributionEditor.h

GUI/View/Instrument/DistributionSelector.cpp

GUI/View/Instrument/DistributionSelector.h

GUI/View/Instrument/OffspecDetectorEditor.cpp

GUI/View/Instrument/OffspecDetectorEditor.h

GUI/View/Instrument/PolarizationAnalysisEditor.cpp

GUI/View/Numeric/ComboUtil.cpp

GUI/View/Numeric/ComboUtil.h

GUI/View/Numeric/FixupDoubleValidator.cpp

GUI/View/Numeric/NumWidgetUtil.cpp

GUI/View/Numeric/NumWidgetUtil.h

GUI/View/Numeric/NumberUtil.cpp