remove all useless header comments (#3363)

see #3358

used command: `find ./ -type f -exec perl -i -0pe
's/\/\*\s*magicmirror.*?\*\/\s*//si' {} \;`

This is a first draft, I think we should preserve some of the comments.

modules/default/calendar/calendar.js

@@ -1,11 +1,5 @@
 /* global CalendarUtils */
 
-/* MagicMirror²
- * Module: Calendar
- *
- * By Michael Teeuw https://michaelteeuw.nl
- * MIT Licensed.
- */
 Module.register("calendar", {
 	// Define module defaults
 	defaults: {

modules/default/calendar/calendarfetcher.js

@@ -1,10 +1,3 @@
-/* MagicMirror²
- * Node Helper: Calendar - CalendarFetcher
- *
- * By Michael Teeuw https://michaelteeuw.nl
- * MIT Licensed.
- */
-
 const https = require("node:https");
 const ical = require("node-ical");
 const Log = require("logger");

modules/default/calendar/calendarfetcherutils.js

@@ -1,10 +1,3 @@
-/* MagicMirror²
- * Calendar Fetcher Util Methods
- *
- * By Michael Teeuw https://michaelteeuw.nl
- * MIT Licensed.
- */
-
 /**
  * @external Moment
  */

modules/default/calendar/calendarutils.js

@@ -1,9 +1,3 @@
-/* MagicMirror²
- * Calendar Util Methods
- *
- * By Rejas
- * MIT Licensed.
- */
 const CalendarUtils = {
 
 	/**

modules/default/calendar/debug.js

@@ -1,9 +1,6 @@
 /* CalendarFetcher Tester
  * use this script with `node debug.js` to test the fetcher without the need
  * of starting the MagicMirror² core. Adjust the values below to your desire.
- *
- * By Michael Teeuw https://michaelteeuw.nl
- * MIT Licensed.
  */
 // Alias modules mentioned in package.js under _moduleAliases.
 require("module-alias/register");

modules/default/calendar/node_helper.js

@@ -1,9 +1,3 @@
-/* MagicMirror²
- * Node Helper: Calendar
- *
- * By Michael Teeuw https://michaelteeuw.nl
- * MIT Licensed.
- */
 const NodeHelper = require("node_helper");
 const Log = require("logger");
 const CalendarFetcher = require("./calendarfetcher");