correct some variable shadowing

GUI/Model/Model/ParameterTreeUtil.cpp

GUI/Support/Util/String.cpp

GUI/View/Import/RealDataSelectorWidget.cpp

GUI/View/Instrument/InstrumentView.cpp

GUI/View/Instrument/PolarizationAnalysisEditor.cpp

GUI/View/Item/ItemViewOverlayButtons.cpp

GUI/View/JobControl/JobListing.cpp

GUI/View/PlotSpecular/SpecularPlot.cpp

GUI/View/PlotUtil/ColorMap.cpp

Resample/Processed/Slicer.cpp

Sample/Particle/PolyhedralUtil.cpp

Sample/StandardSamples/FeNiBilayerBuilder.cpp

Sample/StandardSamples/SlicedCylindersBuilder.cpp