merge PlotConstants into Style

GUI/Support/Tool/mainwindow_constants.h

GUI/Support/Util/Style.cpp

GUI/Support/Util/Style.h

GUI/View/Fit/FitActivityPanel.cpp

GUI/View/Fit/FitSessionWidget.cpp

GUI/View/Fit/JobRealTimeWidget.cpp

GUI/View/FitControl/RunFitControlWidget.cpp

GUI/View/FitMessage/JobMessagePanel.cpp

GUI/View/Import/ImportDataView.cpp

GUI/View/Job/JobViewActivities.cpp

GUI/View/JobControl/JobPropertiesWidget.cpp

GUI/View/JobControl/JobSelectorWidget.cpp

GUI/View/Main/AboutDialog.cpp

GUI/View/Main/MainWindow.cpp

GUI/View/Mask/MaskEditorToolbar.cpp

GUI/View/PlotComparison/HistogramPlot.cpp

GUI/View/PlotSpecular/SpecularPlot.cpp

GUI/View/PlotUtil/ColorMap.cpp

GUI/View/PlotUtil/PlotConstants.h

GUI/View/PlotUtil/StatusLabel.cpp