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

.eslintrc.json

@@ -7,6 +7,7 @@
 	"extends": ["eslint-config-airbnb-base", "plugin:prettier/recommended"],
 	"plugins": ["mocha"],
 	"rules": {
+		"import/extensions": 0,
 		"max-classes-per-file": 1,
 		"no-empty": [
 			2,