DialogCreator is now configured globally which makes it cumbersome to customize it in a multi module environment.

It should be removed from BlossomModuleConfiguration and be configured as a bean per BlossomDispatcherServlet where it should be found by id.

As a consequence BlossomDialogDescription needs to hold a reference to its local DialogCreator which needs to be set by DialogExporter. To task of providing a default DialogCreator will probably have to fall on DialogExporter rather than on BlossomDispatcherServlet.