more work on authorization handler

receiver/CMakeLists.txt

receiver/src/connection.h

receiver/src/connection_authorizer.cpp

receiver/src/connection_authorizer.h

receiver/src/receiver_config.cpp

receiver/src/receiver_config.h

receiver/src/request.cpp

receiver/src/request.h

receiver/src/request_handler.h

receiver/src/request_handler_authorize.cpp

receiver/src/request_handler_authorize.h

receiver/src/request_handler_db_write.cpp

receiver/src/request_handler_db_write.h

receiver/src/request_handler_file_write.cpp

receiver/src/request_handler_file_write.h

receiver/src/requests_dispatcher.cpp

receiver/src/requests_dispatcher.h

receiver/src/statistics.h

receiver/unittests/mock_receiver_config.cpp

receiver/unittests/receiver_mocking.h