Remove JEM_USE_INTRA_BOUNDARY and HEVC_USE_4x4_DSTVII

Use a single array with elements that comprise scan x position, y
position, and index into block instead of separate arrays.

Simplify array initialization code

There is a conflict with JVET_M0427_INLOOP_RESHAPER that is triggering a debug assertion that checks that the width is not 1.

  * Division table reduction
  * bit-width restriction

removed binary decision tree (seems to be a bit of an overkill at this stage of the project) as a preparation for the integration of M0421

removed binary decision tree (seems to be a bit of an overkill at this stage of the project) as a preparation for the integration of M0421

code optimization of triangle weighting process

number of regular coded bins", version CE-7.1.3b (with modified
binarization), including restrictions for chroma 2x2 subblocks.

number of regular coded bins", version CE-7.1.3b (with modified
binarization), including restrictions for chroma 2x2 subblocks.