* remove errorstate and abstractstate
* parameterization of interpreter (related) classes
* interpreter.data package
* finished Rule and ProofScriptCommandBuilder
* VariableAssignment use Variable as key data type
* Contrapositon as test case

* 'master' of git.scc.kit.edu:xt9634/ProofScriptParser:
  adderd flag for matchexpreesion

* 'master' of git.scc.kit.edu:xt9634/ProofScriptParser:
  Small working debugger, with some little quirks.

* [FEATURE] CommandLookup
* [FEATURE] InterpreterTest for testing the interpreter; includes helper commands like assert/assertEq
* [FEATURE] Listeners for Evaluator and Interpreter
   * including History and Logger listener for the start
* [FEATURE] Interpreter has scrict or non-script mode (exception on not selected goals)
* [FEATURE] Interpreter has a logger instance
* [FEATURE] default ast visitor has defaultVisit method