Pre-merge code cleanup

src/opticalcontroller/Dockerfile

src/opticalcontroller/README.md

src/opticalcontroller/RSA.py

src/opticalcontroller/requirements.in

src/opticalcontroller/requirements_opt.txt

src/opticalcontroller/requirements_optical_ctrl_test.txt

src/opticalcontroller/test.py

src/opticalcontroller/tools.py

src/opticalcontroller/variables.py

src/service/service/service_handler_api/SettingsHandler.py

...rvice/service/service_handlers/qkd/qkd_service_handler.py