bump version to 0.7.1.c (demo fix)

fix option setting in demo, especially for custom options of test samples like autobeam
previously, these options weren't reset correctly, and even sometimes always set to false
for other samples

src/OpenSheetMusicDisplay/OpenSheetMusicDisplay.ts

@@ -27,7 +27,7 @@ import {AutoColorSet} from "../MusicalScore";
  * After the constructor, use load() and render() to load and render a MusicXML file.
  */
 export class OpenSheetMusicDisplay {
-    private version: string = "0.7.1b-dev"; // getter: this.Version
+    private version: string = "0.7.1c"; // getter: this.Version
     // at release, bump version and change to -release, afterwards to -dev again
 
     /**