[FaceRecognizer] added detection improvements

RoI - region of interest around detected face
Next detection in previous selected RoI - smaller size to search for a
face
Edited detection properties - scale image, bigger objects and rough
search
implemented function to detect if the face is moving or not (threshold
function)
[Fix] Use region of interest in detection

Fixed region, need to solve scaling by using face detection ( shaking of
detected region )
[CoreWindow] close all windows on exit

Close all windows when main window is closed (children)
[FaceRecognizer] changed recognition

Fixed error (rectangle around face out of Mat frame)
Removed shaking computation
If movement is less than threshold, rectangle around face stay at same
position
Added QDialog for parent/child
Merge branch 'features-optimalisationFaceDetection-Marek' of https://github.com/marconak/Arvis into develop