tracker/pt: replace original blob center search with meanshift

The functions are almost identical so why not.

I removed several bits:

- weighting by squared pixel value is bad. weight by pixel
  value instead.
- making the ROI twice as big doesn't make sense and makes for
  misdetected blobs. remove it.
- switch radius coefficient to something doing less iterations.
- sprinkle some __restrict pointer qualifier.
- cv::floodfill invocation had some hardcoded flag value.
- point radius circle and the bullseye line length weren't
  adjusted by scaling ratio. while the circle fitted the radius
  tightly, it was now clutter, so I removed it, leaving only the
  properly-scaled bullseye.
- brightness had to go sadly since it's not accumulated anymore.

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