Make LiveVariablesAnalysis use ASimpleDeclaration instead of Strings or CSimpleDeclaration, as this analysis should be easy to implement for java programs, this step is necessary.

git-svn-id: https://svn.sosy-lab.org/software/cpachecker/trunk@14633 4712c6d2-40bb-43ae-aa4b-fec3f1bdfe4c