Improve settings-modal async loading, update vue to 2.6.11 to be able

to use Vue.observable, to implmement resettable async component

src/services/resettable_async_component.js

@@ -0,0 +1,32 @@
+import Vue from 'vue'
+
+/* By default async components don't have any way to recover, if component is
+ * failed, it is failed forever. This helper tries to remedy that by recreating
+ * async component when retry is requested (by user). You need to emit the
+ * `resetAsyncComponent` event from child to reset the component. Generally,
+ * this should be done from error component but could be done from loading or
+ * actual target component itself if needs to be.
+ */
+function getResettableAsyncComponent (asyncComponent, options) {
+  const asyncComponentFactory = () => () => ({
+    component: asyncComponent(),
+    ...options
+  })
+
+  const observe = Vue.observable({ c: asyncComponentFactory() })
+
+  return {
+    functional: true,
+    render (createElement, { data, children }) {
+      //  emit event resetAsyncComponent to reloading
+      data.on = {}
+      data.on.resetAsyncComponent = () => {
+        observe.c = asyncComponentFactory()
+        // parent.$forceUpdate()
+      }
+      return createElement(observe.c, data, children)
+    }
+  }
+}
+
+export default getResettableAsyncComponent