feat: persist global track visibility status and metronome status

src/core/project-upgrader/upgradeToV16.ts

@@ -0,0 +1,17 @@
+import { KGProject } from '../KGProject';
+
+export function upgradeToV16(project: KGProject): KGProject {
+  try {
+    if (typeof project.getShowGlobalTracks() !== 'boolean') {
+      project.setShowGlobalTracks(false);
+    }
+
+    if (typeof project.getIsMetronomeEnabled() !== 'boolean') {
+      project.setIsMetronomeEnabled(false);
+    }
+  } finally {
+    project.setProjectStructureVersion(16);
+  }
+
+  return project;
+}