MV entropy coding fixes and clean ups.
Consistently uses cdfs for all mv symbols, and resolves some inconsistencies. All the legacy code dealing with probabilities and counts can now be removed. BDRATE (lowres 30 frames): -0.04% (a slight improvement). Change-Id: Ie27c8e3594e60080e4d155a3ea11c320caa1d85d
Showing with 58 additions and 27 deletions