rename file (no double plural)

GUI/Model/Data/DataItem.cpp

GUI/Model/Data/IntensityDataItem.cpp

GUI/Model/Data/SpecularDataItem.cpp

GUI/Model/Device/AxisItems.cpp

GUI/Model/Device/AxisItems.h

GUI/Model/Device/PointwiseAxisItem.h

GUI/Model/FromCore/ItemizeSimulation.cpp

GUI/View/Common/IntensityDataPropertyWidget.cpp

GUI/View/Device/SphericalAxisForm.cpp

GUI/View/PlotComparison/FitComparisonWidget.cpp

GUI/View/PlotComparison/FitComparisonWidget1D.cpp

GUI/View/PlotSpecular/SpecularDataPropertyWidget.cpp

GUI/View/PlotSpecular/SpecularPlot.cpp

GUI/View/PlotUtil/ColorMap.cpp

GUI/View/PlotUtil/RangeUtils.cpp

GUI/View/Projection/ProjectionsPlot.cpp

Tests/Unit/GUI/TestLinkInstrument.cpp