Complete challenge solution for ArgoUML SPL benchmark

This challenge solution supports all four types of traces using the following visitors from Javaparser.

• Class: ClassOrInterfaceDeclaration, EnumDeclaration, AnnotationDeclaration
• Class refinement: ImportDeclaration, FieldDeclaration, EnumConstantDeclaration
• Method: MethodDeclaration, ConstructorDeclaration
• Method refinement: InstanceOfExpr, ClassExpr, ObjectCreationExpr, MethodCallExpr, BinaryExpr

Challenge solution published at SPLC 2019

This is the challenge solution as described in the following publication:

Müller, R. & Eisenecker, U. (2019). A Graph-Based Feature Location Approach Using Set Theory: [Challenge Solution]. In Proceedings of the 23rd International Systems and Software Product Line Conference - Volume A (pp. 161–165), ACM, Paris, France.