v0.2
1. Add check() and alert() interface, check() use to check the value, alert() use to trigger Detector.
2. Delete original output, because monitor did not need to output, it should only monitoring and decide if trigger Detector.

v0.3
1. Add head file protection.
2. Add wake_detector() interface.
3. Monitor connect to Detector successfully.

v0.4
1. Complete struct det_msg.
2. Complete fill_msg.

