Atomize model classes

software/src/data/models/acts/concertApiModel.ts

@@ -0,0 +1,8 @@
+import { LocationApiModel } from "../locations/locationApiModel"
+import { ConcertModel } from "./concertModel"
+import { EventApiModel } from "./eventApiModel"
+
+export class ConcertApiModel extends ConcertModel {
+  location: LocationApiModel = new LocationApiModel()
+  event: EventApiModel = new EventApiModel()
+}