Revamp of the Settings State System along with TypeScript support (#1560)

* Add vue-rx, rxjs and lodash as dependencies

* Added vue-rx plugin integration to nuxt config

* Initial settings store implementation

* Add babel plugin for private class properties to for Jest

* Add DispatchingStore test spec

* Initial settings code

* Reactive Streams for fb current user and id token

* Fix typo

* Migrate index and graphql pages to the new store

* Migrate network strategy to the new store

* Fixed Section.vue errors

* Fix getSettingSubject issue

* Migrate fb settings reference in components to the new state system

* Add typings for lodash as dev dependency

* Load setting

* Load initial sync setting values

* Update proxy url

* Add typescript support

* Rewrite Settings store to TypeScript

* Port Settings page to TypeScript as reference

* Move all store migrations to a separate file

* Delete test file for fb.js

* Add ts-jest as dev dependency

* Remove firebase-mock as dependency

* Remove FRAME_COLORS_ENABLED settings value

helpers/migrations.ts

@@ -0,0 +1,17 @@
+import { settingsStore, applySetting } from "~/newstore/settings"
+
+/*
+ * This file contains all the migrations we have to perform overtime in various (persisted)
+ * state/store entries
+ */
+
+export function performMigrations(): void {
+
+  // Migrate old default proxy URL to the new proxy URL (if not set / overridden)
+  if (
+    settingsStore.value.PROXY_URL === "https://hoppscotch.apollosoftware.xyz/"
+  ) {
+    applySetting("PROXY_URL", "https://proxy.hoppscotch.io/")
+  }
+
+}