quad: use normalized pwm value throughout app

quad/scripts/tests/test_safety_checks.rb

quad/scripts/tests/testing_library.rb

quad/src/graph_blocks/node_mixer.c

quad/src/graph_blocks/node_mixer.h

quad/src/quad_app/PID.h

quad/src/quad_app/actuator_command_processing.c

quad/src/quad_app/actuator_command_processing.h

quad/src/quad_app/control_algorithm.c

quad/src/quad_app/controllers.h

quad/src/quad_app/hw_iface.h

quad/src/quad_app/initialize_components.c

quad/src/quad_app/log_data.c

quad/src/quad_app/quad_app.c

quad/src/quad_app/send_actuator_commands.c

quad/src/quad_app/send_actuator_commands.h

quad/src/quad_app/sensor.c

quad/src/quad_app/sensor_processing.h

quad/src/quad_app/type_def.h

quad/src/quad_app/user_input.c

quad/src/quad_app/user_input.h