JVET-M0470: Fixed transition point between GR and TU + EG(k) escape codes for coefficient...

Muhammed Cobanrequested to merge
mcoban/VVCSoftware_VTM:JVET-M0470 into master

Fixed transition point between GR and TU + EG(k) escape codes for coefficient coding. Use limited prefix length for escape codes, worst case length 32.

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