Stop callback before deleting the AlgorithmTimer

Added a flag for the RateHistogram class to stop the callback before deleting the AlgorithmTimer. If the timer is going to be deleted the flag announces, that callback (pending signal) should not be started again. If the callback receives information (with 50*duration delay maximum) it sends information back to stop() and then the timer is deleted.

Related to ATR-20796

Tagging @tbold @rbielski @fwinkl