Implement math helpers for libtuning. This includes:
- Average, a wrapper class for numpy averaging functions
- Gradient, a class that represents gradients, for distributing and
mapping
- Smoothing, a wrapper class for cv2 smoothing functions
Signed-off-by: Paul Elder <paul.elder@ideasonboard.com>
Reviewed-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com>
