Java Backend Debugger (krun --debugger flag)

Contains changes to support the debugger option when KRun is run using the Java Backend. KRun can  be used with the --debugger flag.
Following features are currently working:
1) Step
2) Step All
3) Resume
4) Print State
5) Print Transition - shows rule, retrieved from the k file at the moment. Needed slight change to Java Rewrite Engine.
6) State Selection, viewing graph etc.

More features to be added. Maude debugger legacy code was not altered.


this should probably be a helpr method, like it is in KRunApiDebugger