QTGMC: SearchParam for hex and umh

[erazortt]

The SearchParam for Search=4 and 5 look very suspicious. I would have expected them to increase in radius for the slower presets, especially for placebo, very slow and slow.
Following the x264 documentation the search range for hex (=4) and umh (=5) can be up to 16 or 24. At a maximal range of 2 I doubt that uhm and hex are much better then Search=2 with SearchParam=2.
I tested that hypothesis by returning the "noiseWindow" clip and scrolling through a film and comparing Search=0,4,5 at SearchParam=2. And indeed the result was basically identical for SearchParam=2. Increasing SerachParam for hex and umh however yielded much better results the more the content was moving.