Use strict mode

Add strict mode directives to all js files.

lib/config/index.js

@@ -3,6 +3,7 @@
  * @author Hornwitser
  * @module lib/config
  */
+"use strict";
 module.exports = {
 	...require("./classes"),
 	...require("./definitions"),

lib/errors.js

@@ -2,6 +2,7 @@
  * Errors thrown in Clusterio
  * @module
  */
+"use strict";
 
 /**
  * Thrown by commands when they fail

lib/factorio/index.js

@@ -3,6 +3,7 @@
  * @module lib/factorio
  * @author Hornwitser
  */
+"use strict";
 module.exports = {
 	...require("lib/factorio/export"),
 	...require("lib/factorio/patch"),

lib/fileOps/fileOps.js

@@ -1,6 +1,7 @@
 /**
  * @module lib/fileOps
  */
+"use strict";
 const fs = require("fs-extra");
 const path = require("path");
 

lib/fileOps/index.js

@@ -1,2 +1,3 @@
+"use strict";
 const fileOps = require("./fileOps");
 module.exports = fileOps;

lib/generateSSLcert.js

@@ -1,3 +1,4 @@
+"use strict";
 const forge = require("node-forge");
 const fs = require("fs-extra");
 const util = require("util");

lib/hash.js

@@ -2,6 +2,7 @@
  * Hashing functions
  * @module
  */
+"use strict";
 const crypto = require("crypto");
 const fs = require("fs");
 

lib/helpers.js

@@ -2,6 +2,7 @@
  * Collection of small utilites that are useful in multiple places.
  * @module
  */
+"use strict";
 
 /**
  * Return a string describing the type of the value passed

lib/link/index.js

@@ -3,6 +3,7 @@
  * @module lib/link
  * @author Hornwitser
  */
+"use strict";
 module.exports = {
 	...require("lib/link/link"),
 	...require("lib/link/messages"),

lib/luaTools.js

@@ -2,6 +2,7 @@
  * Utilities for dealing with Lua
  * @module
  */
+"use strict";
 
 /**
  * Escapes a string for inclusion into a lua string

lib/manager/modManager.js

@@ -3,6 +3,7 @@ Provides tools to manage mods in a clusterio install
 @module
 */
 
+"use strict";
 const asTable = require("as-table").configure({delimiter: " | "});
 const moment = require("moment");
 const syncRequest = require("sync-request");

lib/npmPostinstall.js

@@ -1,3 +1,4 @@
+"use strict";
 var http = require("http");
 var https = require("https");
 var fs = require("fs-extra");

lib/objectOps.js

@@ -2,6 +2,7 @@
 Helper functions related to objects
 @module
 */
+"use strict";
 
 /**
 Deep clones an object, is actually just JSON.parse(JSON.stringify()) but looks cleaner.

lib/prometheus.js

@@ -1,3 +1,4 @@
+"use strict";
 class Metric {
 	constructor(type, name, help, labels = []) {
 		if (typeof name !== "string") {

lib/schema.js

@@ -2,6 +2,7 @@
  * JSON schemas used for validating link messages
  * @module
  */
+"use strict";
 const ajv = new (require("ajv"))({
 	verbose: true,
 	format: "full",