removed unnecessary factory classes, simplified existing services

static/js/services/view-array/view-array.ts

@@ -1,3 +1,4 @@
+import { ViewArrayImpl } from "static/js/services/view-array/view-array.impl";
 /**
  * Specialized wrapper around array which provides a toggle() method for viewing the contents of the
  * array in a manner that is asynchronously filled in over a short time period. This prevents long
@@ -59,4 +60,10 @@ export abstract class ViewArray {
      * @param newState True/False if the contents are visible.
      */
     public abstract setVisible(newState: boolean): void;
+
+    /**
+     * Factory function to create a new ViewArray.
+     * @return viewArray New ViewArray instance.
+     */
+    public abstract create(): ViewArrayImpl;
 }