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/environmentVariables.js

@@ -1,15 +1,15 @@
 class EnvironmentVariables {
-   constructor(variables) {
-      this.variables = variables || process.env;
-   }
+  constructor(variables) {
+    this.variables = variables || process.env;
+  }
 
-   get(variable) {
-      return this.variables[variable];
-   }
+  get(variable) {
+    return this.variables[variable];
+  }
 
-   has(variable) {
-      return this.get(variable) !== undefined;
-   }
+  has(variable) {
+    return this.get(variable) !== undefined;
+  }
 }
 
 module.exports = EnvironmentVariables;