Compiling error fix in IntraPrediction.cpp when JVET_M0102_INTRA_SUBPARTITIONS is disabled

See merge request jvet/VVCSoftware_VTM!270

SW and spec mismatch related to wide angle #174

See merge request !260

remove SPSNext extension and sort SPS

See merge request !268

- all elements of SPSNext are moved into SPS
- syntax elements of SPS are sorted according to draft (as far as possible)
- comments were added where software and draft diverge

fix typo in tracing code

See merge request !267

fix IBC indication in reshaper and hash ME

See merge request !262

fix ENABLE_TRACING build

See merge request !264

Keep align syntax-element variable with trace

See merge request !261

- fix block statistics code for IBC mode after JVET_M0483_IBC
- enable build of block statistics code, when ENABLE_TRACING is specified on the command line

- removes old getIBCMode functions from SPSNext
- fixes references to this function in
  * reshaper
  * hash based ME

Note: SPSNext is going to be removed. Fixes can also be applied with the removal patch.

Clean up scan data arrays

See merge request jvet/VVCSoftware_VTM!257

Fix spaces and indentation in CabacReader

See merge request !259

Remove outdated macros and associated code

See merge request !258

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

Align ALF trace with specification

See merge request !255

Cleanup CABAC contexts

See merge request jvet/VVCSoftware_VTM!253

Remove unused variables / declarations

See merge request !254

Remove unused contexts and split intra mode contexts into luma and
chroma sets to align with text description

Update the software documentation/manual for VTM/JVET

See merge request jvet/VVCSoftware_VTM!252

- change README.txt to markdown (displays in GitLab)
- update build instructions
- update LaTEX document template for JVET and include it
- general updates for the software manual (authors, purpose, etc.)
- update build instructions (aligned with README)
- use code highlighting (requires Pygments installation)
- minor formatting updates

[Cosmetics] Cleanup trailing spaces

See merge request !240

Fixed the bugs of Ticket #169 in IntraPrediction.cpp

See merge request !251

fix for issue #171 (negative shift)

See merge request !250

calculate and check shifts only when they are actually used

Cleanup: Remove unnecessary code/processing for MTS zero-out in DepQuant

See merge request !248

Fix: Prevents usage of wrong contexts in DepQuant

See merge request !247

M0421 aligned with proposed draft text (btDepth -> mttDepth), issue #170

See merge request !246