update dbmData and Subscription so it is reactive

new save load scenes

src/models/Scene.ts

@@ -0,0 +1,9 @@
+import type { Value } from './Value';
+
+export interface Scene {
+  name: string;
+  description?: string;
+  movingHead: boolean;
+  lightBar: boolean;
+  values?: Value[];
+}