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.

js/module.js

@@ -1,11 +1,7 @@
 /* global Class, cloneObject, Loader, MMSocket, nunjucks, Translator */
 
-/* MagicMirror²
- * Module Blueprint.
+/* Module Blueprint.
  * @typedef {Object} Module
- *
- * By Michael Teeuw https://michaelteeuw.nl
- * MIT Licensed.
  */
 const Module = Class.extend({