SMPOpenUIEmbeddedImageDisplayAdapter protocol

Protocol for a field extension representing an embedded image field.

• initWithEmbeddedImageModel: method
  Called to initialize the extension with its model.
• model:didChangeImage: method
  Called to inform the adapter that the field's underlying image has changed, and it needs to be updated to display the correct value.
• modelDidChangeImageCellSelection: method
  Called to inform the adapter that image selection has changed.