[Fix] Method analyzer doesn't locate override implementations when layered

[JPaja]

Fixes #198

[Washi1337]

This is unfortunately not an acceptable solution, since it completely flattens (= destroys) the type hierarchy that is supposed to be encoded in the dependency graph. This is important if we want to query information like the immediate inheritor or the immediate base definition of a member.

Detection like this should happen at the detection level, not in the graph itself.