Simplify Zero bin and zero bin run code.
Simplification to eliminate a number of very large data data structures. All zero run, zbin boosts for different transform sizes are now limited to a maximum run length of 15 before they max out the boost. Some further work still needs be done to refactor, rationalize and optimize the multiple quantizer functions. The simplification coupled with tweaks to the 16 element array now used for all transform sizes, has minimal effect on quality. Change-Id: I6f3948b8ca0418b60d4db9030ff19026a34ed423