Adds resize boxes to an interactor.
The interactor must implement the IRelocate interface in order for the resize boxes to have any effect.
Resizing an interactor is implemented by changing its transformation. For interactors that have a zero width/height this impossible, as these cannot be scaled. If such interactors are encountered, a new transformation is computed that assumes that the existing width/height is 1. Interactors that implement the IRelocate interface should take this into account.
public class ResizeLayer : WinFormsInteractorLayer