add petaluma notefont support for vexflow 3.0.9 (#924)

src/MusicalScore/Graphical/VexFlow/VexFlowMusicSheetCalculator.ts

@@ -68,9 +68,12 @@ export class VexFlowMusicSheetCalculator extends MusicSheetCalculator {
 
     // prepare Vexflow font (doesn't affect Vexflow 1.x). It seems like this has to be done here for now, otherwise it's too slow for the generateImages script.
     //   (first image will have the non-updated font, in this case the Vexflow default Bravura, while we want Gonville here)
-    if (this.rules.DefaultVexFlowNoteFont === "gonville") {
+    if (this.rules.DefaultVexFlowNoteFont?.toLowerCase() === "gonville") {
       (Vex.Flow as any).DEFAULT_FONT_STACK = [(Vex.Flow as any).Fonts?.Gonville, (Vex.Flow as any).Fonts?.Bravura, (Vex.Flow as any).Fonts?.Custom];
-    } // else keep new vexflow default Bravura (more cursive, bold)
+    } else if (this.rules.DefaultVexFlowNoteFont?.toLowerCase() === "petaluma") {
+      (Vex.Flow as any).DEFAULT_FONT_STACK = [(Vex.Flow as any).Fonts?.Petaluma, (Vex.Flow as any).Fonts?.Gonville, (Vex.Flow as any).Fonts?.Bravura];
+    }
+    // else keep new vexflow default Bravura (more cursive, bold)
   }
 
   protected clearRecreatedObjects(): void {