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/weather/weatherobject.js

@@ -1,17 +1,5 @@
 /* global SunCalc, WeatherUtils */
 
-/* MagicMirror²
- * Module: Weather
- *
- * By Michael Teeuw https://michaelteeuw.nl
- * MIT Licensed.
- *
- * This class is the blueprint for a day which includes weather information.
- *
- * Currently this is focused on the information which is necessary for the current weather.
- * As soon as we start implementing the forecast, mode properties will be added.
- */
-
 /**
  * @external Moment
  */