Extend cfg comparison with local rename mapping

[stilscher]

As discussed in #731 the rename mapping introduced for detecting renames of local variables or formal parameters in the AST comparison can easily be passed through to the cfg comparison. In updateCil.ml one then has to update the old names of the local variables and parameters also for partially changed functions for a correct output. With this, the cfg comparison could also profit from being able to match renamed locals.

[TimOrtel]

The propagation is now implemented in this PR. However, the actual detection of renames is not enabled nor tested. Right now, only the renamesOnSuccess are propagated.