Added consolidated loading, see #682:

- New version of API in 'new-backend', v2. Same endpoints but different response: the new response consolidates previousl 3 separate requests and eliminates the need of them.
- Changes in client to accomodate the new API: index rewritten - both old and new loading possible. Which is choosen is controlled by the 'experimentalNewApi' flag in appConfig.json. I had the opportunity to also consolidate the error rendering in index, it's now more consistent. Finally, some changes in MapSwitcher - we get the list of user specific maps from our new consolidated response and there's no need to do separate fetch anymore.
- Added ESlint plugin to allow private fields/methods.

new-backend/.eslintrc.json

@@ -4,7 +4,7 @@
   "env": {
     "mocha": true
   },
-  "plugins": ["prettier", "node"],
+  "plugins": ["prettier", "node", "@babel/plugin-proposal-private-methods"],
   "parserOptions": {
     "sourceType": "module"
   },

new-backend/server/api/controllers/configV2/controller.js

@@ -0,0 +1,21 @@
+import ConfigServiceV2 from "../../services/config.service.v2";
+import ad from "../../services/activedirectory.service";
+import handleStandardResponse from "../../utils/handleStandardResponse";
+
+export class Controller {
+  /**
+   * @summary Get a specific map config using the supplied
+   * request parameter "map" as map's name.
+   *
+   * @param {*} req
+   * @param {*} res
+   * @memberof Controller
+   */
+  byMap(req, res) {
+    ConfigServiceV2.getMapWithLayers(
+      req.params.map,
+      ad.getUserFromRequestHeader(req)
+    ).then((data) => handleStandardResponse(res, data));
+  }
+}
+export default new Controller();

new-backend/server/api/controllers/configV2/router.js

@@ -0,0 +1,4 @@
+import * as express from "express";
+import controller from "./controller";
+
+export default express.Router().get("/:map", controller.byMap); // Get specific map config