Improve annotations to work in both vertical and horizontal plots (#9154)

* Move enums to RiaPlotDefines.h
* Add support for formation names shading in horizontal plots
* Refactor line property code
* modernize code

ApplicationLibCode/ProjectDataModel/Summary/RimSummaryPlot.cpp

@@ -217,6 +217,8 @@ void RimSummaryPlot::updateAxes()
     updateAxis( RiaDefines::PlotAxis::PLOT_AXIS_LEFT );
     updateAxis( RiaDefines::PlotAxis::PLOT_AXIS_RIGHT );
 
+    m_summaryPlot->clearAnnotationObjects();
+
     if ( timeAxisProperties() && plotWidget() )
     {
         m_summaryPlot->updateAnnotationObjects( timeAxisProperties() );