Format code

@neshanjo
A simple example how to add a formatter.
I used beautifier, because its so easy to add.
And it does not need an internet connection.
Steps:

• add a file to js/plugins with following code
  
• add a script tag in main.html to the new plugin
  
• add beautify folder in js/libs
  
• add beautify-file from github into this new folder
  

• add script tag in main.html to beautify-file

  "use strict";
  (function(){
  var iconFolder;
  function init() {
    showIcon();
  }
  function showIcon(){
    iconFolder = Espruino.Core.App.addIcon({
      id: 'formatCode',icon: 'snippets',title: 'Prettyfie',order: 510,
      area: { name: "code",position: "top"},
      click: prettyfie
   });
  }
  function prettyfie(){
     var code = Espruino.Core.EditorJavaScript.getCode()­;
     code = js_beautify(code);
     Espruino.Core.EditorJavaScript.setCode(c­ode);
  }
  Espruino.Plugins.FormatCode = {
    init : init,  
  };
  }());
  
  

  ```