Feat: es modules (#139)

* All file imports change from commonjs to es-module

* Improved plex error responses back from api

* Converted viewHistory to es module

* Es-module requires file extension, updated all imports

* Fix esmodule not having __dirname defined in scope

* Replace dynamic-require with fs readFileSync

* Short message service module function is exported as default

* Resolved lint issues & ignore import/extension rule until typescript

* All tests file imports changed from commonjs to es-module

* Import json fixtures with new helper

tests/system/asADeveloperIWantTheServerToStart.js.disabled

@@ -1,6 +1,6 @@
 /* eslint-disable no-return-assign */
-const net = require("net");
-const server = require("../../src/webserver/server");
+import net from "net";
+import server from "../../src/webserver/server.js";
 
 describe("As a developer I want the server to start", () => {
   after(() => {