Add new decomb modes

This is jbrjakes decomb3 patch.
New modes are gamma compensation and erode dialate filter.
Gamma adjusting pixel values makes less visible differences count less
in the metric that is calculated.  Filtering removes isolated "hits"
that are more likely noise.  This all makes decomb more discerning and
therefore the thresholds can be lowered.

The filter's defaults use these new modes with lower thresholds. If you
want the old behavior, use:
    7:2:6:9:1:80

git-svn-id: svn://svn.handbrake.fr/HandBrake/trunk@4308 b64f7644-9d1e-0410-96f1-a4d463321fa5

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