Implemented the second round of the toResponse normalisationf for all classes

ref #67

src/models/entities/RunnerCard.ts

@@ -57,4 +57,11 @@ export class RunnerCard {
    */
   @OneToMany(() => TrackScan, scan => scan.track, { nullable: true })
   scans: TrackScan[];
+
+  /**
+   * Turns this entity into it's response class.
+   */
+  public toResponse() {
+    return new Error("NotImplemented");
+  }
 }