We have all hardware now
Define the engine on/off status
Support debug printf
This function could print some message when we want to print something directly.
WARNING: Please set configSTATUS_SHELL to 0 (stop shell) when you use debug print
Merge https://github.com/QuadCopterTainan/QuadcopterFlightControl

Conflicts:
	program/QuadCopterConfig.h
	program/system/main.c