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/socketclient.js

@@ -1,11 +1,5 @@
 /* global io */
 
-/* MagicMirror²
- * TODO add description
- *
- * By Michael Teeuw https://michaelteeuw.nl
- * MIT Licensed.
- */
 const MMSocket = function (moduleName) {
 	if (typeof moduleName !== "string") {
 		throw new Error("Please set the module name for the MMSocket.");