Feature: Have JSON loader support loading of area objects.

[GerritBartels]

e.g. in this line: self.info_name_list = [key for key in self.info_json["environment"]["objects"].keys()] only the environment objects are considered. But especially when PITA 2.0 is done, several areas with the keywords "Area1", "Area2" etc. will be present in the JSON files.