Function onViewportDragAndDrop

onViewportDragAndDrop<T>(fnCallback): AttributeDecorator<Attribute>
Adds out-of-the-box drag and drop functionality to subclasses of Resource when the user drags the resource from the library to a scene viewport.

Simply apply the decorator to your subclass of Resource and provide a callback that is called when your resource was dropped on a SceneObject.

The following example shows a potential implementation:
```
\@onViewportDragAndDrop((resource: MyCustomResource, sceneObject: SceneObject) =>
{
	sceneObject.addComponent(MyCustomComponent).resource = resource;
})
```
Type Parameters
- T extends Resource
Parameters
- fnCallback: ((resource: T, sceneObject: SceneObject) => void)
  - - (resource, sceneObject): void
    - Parameters
      resource: T
      sceneObject: SceneObject
      Returns void
Returns AttributeDecorator<Attribute>