Moved all update() and toEntity action model functions to async

ref #76

src/models/actions/update/UpdateTrack.ts

@@ -37,7 +37,7 @@ export class UpdateTrack {
      * Update a Track entity based on this.
      * @param track The track that shall be updated.
      */
-    public update(track: Track): Track {
+    public async update(track: Track): Promise<Track> {
         track.name = this.name;
         track.distance = this.distance;
         track.minimumLapTime = this.minimumLapTime;