port web settings to es6

src/scripts/settings/webSettings.js

@@ -1,27 +1,11 @@
-define(['appStorage', 'events'], function (appStorage, events) {
-    'use strict';
+function getConfig() {
+    return fetch("/config.json?nocache=" + new Date().getUTCMilliseconds()).then(function (response) {
+        return response.json();
+    });
+}
 
-    var data;
-
-    function getConfig() {
-        if (data) {
-            return data;
-        }
-
-        fetch("/config.json").then(function (response) {
-            data = response.json();
-        })
-
-        return data;
-    }
-
-    function WebSettings() {
-        getConfig();
-    }
-
-    WebSettings.prototype.enableMultiServer = function () {
-        return getConfig().multiServer || false;
-    };
-
-    return new WebSettings();
-});
+export function enableMultiServer() {
+    return getConfig().then(config => {
+        return config.multiserver;
+    });
+}