Added first version of DebugManager. Implemented draft of the rule engine

src/evaluators/PrepareEvalQuestionEvaluator.py

@@ -13,6 +13,9 @@ class PrepareEvalQuestionEvaluator(OneReturnValueEvaluator):
         super().__init__(self.NAME, [BuiltinConcepts.BEFORE_PARSING], 90)
         self.question = None
 
+    def reset(self):
+        self.question = None
+
     def matches(self, context, return_value):
         if not (return_value.status and
                 context.sheerka.isinstance(return_value.body, BuiltinConcepts.USER_INPUT) and