WidgetUtils are unified

GUI/View/Common/DoubleSpinBox.cpp

GUI/View/Common/DoubleSpinBox.h

GUI/View/Fit/MinimizerSettingsWidget.cpp

GUI/View/Fit/MinimizerSettingsWidget.h

GUI/View/Instrument/DetectorAlignmentEditor.cpp

GUI/View/Instrument/DetectorAlignmentEditor.h

GUI/View/Instrument/DetectorEditor.cpp

GUI/View/Instrument/DistributionEditor.cpp

GUI/View/Instrument/EnvironmentEditor.cpp

GUI/View/Instrument/FootprintCorrectionEditor.cpp

GUI/View/Instrument/PolarizationAnalysisEditor.cpp

GUI/View/Instrument/PolarizationAnalysisEditor.h

GUI/View/Instrument/RectangularDetectorEditor.cpp

GUI/View/Instrument/ResolutionFunctionEditor.cpp

GUI/View/Instrument/SphericalAxisEditor.cpp

GUI/View/Mask/MaskEditorPropertyPanel.cpp

GUI/View/PlotUtil/IntensityDataPropertyWidget.cpp

GUI/View/PropertyEditor/SpecularDataPropertyWidget.cpp

GUI/View/SampleDesigner/FormLayouter.cpp

GUI/View/SampleDesigner/LayerEditorUtils.cpp