pm: Power management

As demands for flexible power management has increased for realizing more battery efficient solutions, a new group of power management functions are available which implements the possibilities to control the power usage of the RTCU. The new features offer the application to stop executing and wait for an event to occur before proceeding operation from the location where the program was stopped. Another feature is control of the RTCU execution speed and how the device should behave when an external power fail occurs.

	•pmPowerDown	Power down the device and reset when an event happens.
	•pmExternalPower	Enable/disable the external power to run on battery.
	•pmDeepSleep	Makes device sleep for a number milliseconds.
	•pmPowerFail	Sets device behavior when external power fails.
	•pmWaitEvent	Makes device sleep until an event happens by entering a power saving sleep mode.
	•pmSetVibrationsensitivity	Sets the sensitivity of the Vibration sensor.
	•pmVibration	Query whether vibration has been detected since last call.
	•pmSetSpeed	Control the speed of execution.
	•pmSuspend	Makes device sleep until an event happens by entering a power saving sleep mode.
	•pmGetWakeSource	Converts the return code from pmSuspend into usable values.
	•pmGetWakeSourceString	Converts the return code from pmSuspend into a string for debugging.