ConfigParser only stores config data

[bakhtos]

This PR simplifies the responsibilities of the ConfigParser object used internally:

• Communications_tech_list is not given in config, it is now part of technology_switch code
  • Similarly, there is now container_tech_list which bundles together maven, gradle and docker-compose used to detect microservices, allowing it to be extended in the future with more technologies
• What used to be temp.tmp.tmp_config is now core.config.code2dfd_config
  • Defaults are initialized in the same file
• commit field is now part of Repository group, not Analysis settings; the latter IMO should be left for code2DFD-internal things
• DFD is not stored as a string in ConfigParser, it is now a dict of microservices, information_flows and external_components as an intermediate step before migrating to proper objects
  • All detector functions (at least the "entry points") how accept only the dfd object and get the necessary parts internally when necessary, in the end they set the updated datastructures
  • technology_switch is not used as a getter for services/information_flows, the functions are renamed to set_microservices and set_information_flows and are only called once, in the appropriate place in DFD_extraction, all other functions get the data from the dfd dictionary directly