Sum of Differences Evaluation

These functions evaluate difference between current and predicted blocks and calculates sums of elements of all residual blocks.

• SumsDiff16x16Blocks4x4
  Evaluates difference between current and reference 4X4 blocks and calculates sums of 4X4 residual blocks elements for 16X16 blocks.
• SumsDiff8x8Blocks4x4
  Evaluates difference between current and reference 4X4 blocks and calculates sums of 4X4 residual blocks elements for 8X8 blocks.

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