Resolves compilation issue where unused variables triggered a warning

Updates CMake files to account for arm64 architecture.
Consider __ARM_NEON to detect ARM architecture in C++ code.

- includes minor fix for software manual

The value of this parameter is never used

Wei Jia authored 1 year ago and Karsten Suehring committed 1 year ago

JVET-AF0061, JVET-AF0174, JVET-AF0067, and JVET-AF0310: add po_id into the SEI processing order (SPO) SEI message

JVET-AF0062: Move po_sei_prefix_flag[ i ] from immediately before po_sei_payload_type[ i ] to be immediately after po_sei_payload_type[ i ]

These are not meant to be highly optimized.