${SHEETNAME} represents the sheet name + introduce ${SHEETPATH}

CHANGED: The text variable ${SHEETNAME} now always represents the name of the
sheet when used anywhere in the schematic editor, including the title block

ADDED: A new text variable ${SHEETPATH} which is replaced with the path to the
current sheet - e.g. "/Sheet 1/Sheet 2".

To ensure backward compatibility, the default drawing sheet now uses
${SHEETPATH}. Custom drawing sheets will need to be manually edited.

common/plotters/common_plot_functions.cpp

@@ -59,7 +59,8 @@ wxString GetDefaultPlotExtension( PLOT_FORMAT aFormat )
 
 void PlotDrawingSheet( PLOTTER* plotter, const PROJECT* aProject, const TITLE_BLOCK& aTitleBlock,
                        const PAGE_INFO& aPageInfo, const wxString& aSheetNumber, int aSheetCount,
-                       const wxString& aSheetDesc, const wxString& aFilename, COLOR4D aColor,
+                       const wxString& aSheetName, const wxString& aSheetPath,
+                       const wxString& aFilename, COLOR4D aColor,
                        bool aIsFirstPage )
 {
     /* Note: Page sizes values are given in mils
@@ -83,7 +84,8 @@ void PlotDrawingSheet( PLOTTER* plotter, const PROJECT* aProject, const TITLE_BL
     drawList.SetPageNumber( aSheetNumber );
     drawList.SetSheetCount( aSheetCount );
     drawList.SetFileName( fn.GetFullName() );   // Print only the short filename
-    drawList.SetSheetName( aSheetDesc );
+    drawList.SetSheetName( aSheetName );
+    drawList.SetSheetPath( aSheetPath );
     drawList.SetProject( aProject );
     drawList.SetIsFirstPage( aIsFirstPage );