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/defaultmodules.js

@@ -1,8 +1,5 @@
-/* MagicMirror² Default Modules List
+/* Default Modules List
  * Modules listed below can be loaded without the 'default/' prefix. Omitting the default folder name.
- *
- * By Michael Teeuw https://michaelteeuw.nl
- * MIT Licensed.
  */
 const defaultModules = ["alert", "calendar", "clock", "compliments", "helloworld", "newsfeed", "updatenotification", "weather"];