some refactoring

config/tmtcc_user_code.py

core/tmtc_backend.py

core/tmtc_frontend.py

pus_tc/__init__.py

pus_tc/obsw_tc_gps.py

pus_tc/obsw_tc_service2.py

pus_tc/obsw_tc_service3.py

pus_tc/obsw_tc_service8.py

pus_tc/obsw_tc_service9.py

pus_tc/tmtcc_image_handler.py

pus_tc/tmtcc_pus_service17.py

pus_tc/tmtcc_pus_tc_frame_packer.py

pus_tc/tmtcc_pus_tc_utility.py

pus_tc/tmtcc_tc_core.py

pus_tc/tmtcc_tc_mode_service200.py

pus_tc/tmtcc_tc_packer_hook.py

pus_tc/tmtcc_tc_service20.py

pus_tc/tmtcc_tc_service23_sdcard.py

pus_tc/tmtcc_tc_service5.py

pus_tm/__init__.py