Changes include:
- use [[maybe_unused]] instead of cast to (void)
- use generic lambda function and remove related comment about C++11
- update MSVC version check
- don't condition '#pragma once' on MSVC version

Avoid having a separate PTL count since we already have a size
for the vector containing the PTLs.

Add a size check to avoid writing into inexistant PTL. This may
avoid bug reports such as #1587

Emmanuel Thomas authored 4 years ago and Frank Bossen committed 4 years ago

Redo merging. Also inject VPS before SPS with different layer IDs, but with the same content and VPS ID.

JVET-P1019: Output layer set

The fix was confirmed as part of the specification.

Software implementation for N0278:
1. Added VPS encoding in encoder
2. Add new project StreamMergeApp to N-to-1 bitstream merge
3. Changed decoder to support only decoding the specified layer stream