An abstract expression visitor, that can be used for evaluating C and Java Expressions at the same time. All expressions that can be handled the same way without regarding the language (e.g. IntegerLiteralExpression, IDexpression, ...) do only have one visit method that need's to be implemented, instead of one for each language.

git-svn-id: https://svn.sosy-lab.org/software/cpachecker/trunk@14773 4712c6d2-40bb-43ae-aa4b-fec3f1bdfe4c