First working version

image_canvas_editor_api.info.yml

image_canvas_editor_api.libraries.yml

image_canvas_editor_api.permissions.yml

image_canvas_editor_api.routing.yml

image_canvas_editor_api.services.yml

js/editor.js

src/Annotation/ImageCanvasEditor.php

src/Controller/EditorController.php

src/Plugin/EditorInterface.php

src/Plugin/EditorPluginManager.php

src/Plugin/Field/FieldWidget/ImageCanvasEditorWidget.php