RangeUtils: Added MPL Inferno as default color gradient

This MR resolves #273 (closed)

GUI/View/PlotUtil/RangeUtils.h

@@ -20,25 +20,15 @@
 #include <QString>
 
 class AmplitudeAxisItem;
-
 class BasicAxisItem;
-
 class ColorMap;
-
 class DataItem;
-
 class IntensityDataItem;
-
 class SpecularDataItem;
-
 class QCustomPlot;
-
 class QCPAxis;
-
 class QCPColorScale;
-
 class QCPRange;
-
 class QCPColorGradient;
 //! Provides few helper functions for ColorMapPlot.