Show internal class structure

[schauder]

As support for refactoring large classes it might be interesting to visualize the internal structure of classes.

Dependency Finder should be able to provide the necessary information.

This would have to be pluggable / configurable, since when you look at hundreds of classes, you don't want a node for every single field/method/parameter.

Therefore it also relates to issues #14 and #15 which also would modify the thing thats appear in Degraph as a node.