Fix the bug https://github.com/fboris/QuadrotorFlightControl/issues/39

Set correct sensor piority to highest
If AngE or QNum is not in some range, it will re-calibrate again.
Let user know MCU enter some critical point

1)Use MallocFailedHook and blinky LED_R when MCU enter this task
2)Blink LED_R when MCU enter StackOverflowHook