Fix: Linter warnings (#137)

* Automaticly fixable eslint issues, mostly 3 -> 2 space indentation

* fix: updated plex_userid to camelcase

* Linted and some consistency refactor on middleware

* eslint uses ecmaversion 2020 & allow empty catch rule

* Started linting source files

* Fixed eslint errors & improved a lot of error handling

* Set 2 eslint rules as warning temporarly

src/config/configuration.js

@@ -1,11 +1,12 @@
 const path = require("path");
-const Field = require("./field.js");
+const Field = require("./field");
 
 let instance = null;
 
 class Config {
   constructor() {
     this.location = Config.determineLocation();
+    // eslint-disable-next-line import/no-dynamic-require, global-require
     this.fields = require(`${this.location}`);
   }