Add support for interfaces in <universalObjectCrates>

First of all - thank you for the wonderful tool. It helped me a lot in gradually optimizing a big codebase.

Is it possible to add an interface to ? I have an object crate, but its implementations are hidden - all I have is the interface? Right now I am checking if the returned object (which always implements the same interface) is an instance of one of the concrete classes to avoid the error.