T/35 Extracted widget API to separate package

package.json

@@ -8,7 +8,8 @@
     "@ckeditor/ckeditor5-engine": "^0.8.0",
     "@ckeditor/ckeditor5-ui": "^0.7.1",
     "@ckeditor/ckeditor5-utils": "^0.8.0",
-    "@ckeditor/ckeditor5-theme-lark": "^0.6.1"
+    "@ckeditor/ckeditor5-theme-lark": "^0.6.1",
+    "@ckeditor/ckeditor5-widget": "*"
   },
   "devDependencies": {
     "@ckeditor/ckeditor5-clipboard": "^0.4.1",

src/image.js

@@ -9,7 +9,7 @@
 
 import Plugin from '@ckeditor/ckeditor5-core/src/plugin';
 import ImageEngine from './image/imageengine';
-import Widget from './widget/widget';
+import Widget from '@ckeditor/ckeditor5-widget/src/widget';
 import ImageTextAlternative from './imagetextalternative';
 
 import '../theme/theme.scss';

src/image/imageengine.js

@@ -9,7 +9,7 @@
 
 import Plugin from '@ckeditor/ckeditor5-core/src/plugin';
 import buildModelConverter from '@ckeditor/ckeditor5-engine/src/conversion/buildmodelconverter';
-import WidgetEngine from '../widget/widgetengine';
+import WidgetEngine from '@ckeditor/ckeditor5-widget/src/widgetengine';
 import { viewToModelImage, createImageAttributeConverter } from './converters';
 import { toImageWidget } from './utils';
 import ViewContainerElement from '@ckeditor/ckeditor5-engine/src/view/containerelement';

src/image/utils.js

@@ -7,15 +7,15 @@
  * @module image/image/utils
  */
 
-import { toWidget, isWidget } from '../widget/utils';
+import { toWidget, isWidget } from '@ckeditor/ckeditor5-widget/src/utils';
 import ModelElement from '@ckeditor/ckeditor5-engine/src/model/element';
 
 const imageSymbol = Symbol( 'isImage' );
 
 /**
  * Converts given {@link module:engine/view/element~Element} to image widget:
  * * adds {@link module:engine/view/element~Element#setCustomProperty custom property} allowing to recognize image widget element,
- * * calls {@link module:image/widget/utils~toWidget toWidget} function with proper element's label creator.
+ * * calls {@link module:widget/utils~toWidget toWidget} function with proper element's label creator.
  *
  * @param {module:engine/view/element~Element} viewElement
  * @param {String} label Element's label. It will be concatenated with image's `alt` attribute if one is present.

src/imagecaption/utils.js

@@ -10,7 +10,7 @@
 import ModelElement from '@ckeditor/ckeditor5-engine/src/model/element';
 import ViewEditableElement from '@ckeditor/ckeditor5-engine/src/view/editableelement';
 import { attachPlaceholder } from '@ckeditor/ckeditor5-engine/src/view/placeholder';
-import { toWidgetEditable } from '../widget/utils';
+import { toWidgetEditable } from '@ckeditor/ckeditor5-widget/src/utils';
 
 const captionSymbol = Symbol( 'imageCaption' );