Changed

• ⚠️ POSSIBLY BREAKING CHANGE ⚠️ Panel ids are moved to classes
  So if you've used selectors like #gjs-pn-* (in CSS/JS) you should change them to .gjs-pn-*
• Append the Modal inside the container element

Added

• Added remove listener to buttons in panels. Closes #824
• Added the possibility to render panels outside of the main editor container, eg.

  editor.Panels.addPanel({
    id: 'myNewPanel',
    el: 'query-selector', // or HTMLELement
  })

• Added the possibility to render Layers, Block, Styles, Selectors and Traits
  outside of the main editor container (via appendTo option), eg.

  grapesjs.init({
    ...
    layerManager: {
      appendTo: 'query-or-element',
      ...
    },
    blockManager: {
      appendTo: 'query-or-element',
      ...
    },
    styleManager: {
      appendTo: 'query-or-element',
      ...
    },
    selectorManager: {
      appendTo: 'query-or-element',
      ...
    },
    traitManager: {
      appendTo: 'query-or-element',
      ...
    }
  });

  Live demo with a totally custom UI
  https://codepen.io/artf/full/MQpZPj/
  

Fixed

• Fixed toolbar position on window resize #810
• Extend correctly Layers options #812
• Parse correctly the integer value with a function #806
• Execute the callback in StorageManager even with an empty storage