Added common prediction modules.
This function adds the common prediction modules, some data structures and a config option but does not use them. It also corrects a bug in clearing down the MODE_INFO border and introduces a new element that indicates if an entry corresponds to an "in image" macro block or is part of the border. Change-Id: Ib69eec0876173ebe9d1de9df9537d0b2447702e0
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