When decoder parses SEI message of unknown type,
it does not add it to list of SEIs.

But then try to access it by calling back() of the list of SEIs.

If list is empty decoder crashes.

Otherwise (if list is not empty) decoder gets wrong SEI message (one of previously added to the list)

Possible fix is to make xReadSEImessage() and parseSEImessage() report if new SEI message object was added to the list

Move initialisations to declaration for smaller PPS related classes. Define empty
constructors/destructors in header.

- manual reformatting:
  - try to shorten lines
  - keep blocks somewhat aligned
  - remove documentation comments
- make IBC flag bool
- add some braces
- add line breaks into longer functions
- move even longer functions into .cpp file
- move static variables and functions to the end

- move VPS and related classes into VideoParameterSet.h/cpp
- move SPS and related classes into SequenceParameterSet.h/cpp
- move PPS and related classes into PictureParameterSet.h/cpp
- rename ProfileLevelTier.h/cpp to ProfileTierLevel.h/cpp and move ProfileTierLevel class there

No other changes except for minor formatting/comment cleanup

Having a single element reduces the number of data structures that
need to be maintained.

A pointer to a local VPS is passed as reference into the parameter set manager, which takes ownership of the object.
When the local scope is left, the memory will be freed, which can lead to use after free (and double free).

Fixed an issue introduced in !2509

Avoid duplicating variables and functions for each reference list

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

As decided with software style guide update.

Virtual boundaries can be set in the encoder config without enabling GDR. The change makes sure, GDR constraints are conditioned on GDR being enabled.

subsumed setMIPFlagISPPass into setBestPredModeDCT2 and removed getBestPredModeDCT2 (because it was unused)

- remove picture header allocations at the encoder
- use correct boundary location in reference pictures after removal of new PH

Should also fix memory allocation issues with PicHeader.