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JVET-Q0397: Scalable nesting SEI for subpictures

Karsten Suehring requested to merge ksuehring/VVCSoftware_VTM:jvet-q0397-scal-nesting into master

Note: this also contains some bug fixed for scalable nesting SEI itself. These should have gone to the refactoring MR !1627 (merged), but I didn't notice early enough and didn't want to create another MR that this one would depend upon.

  • write/read number of nested SEIs (syntax bug fix)
  • check SEI list after they are actually read (ordering fix)
  • persistent HRD for syntax dependencies (bug fix)
  • improved error messages
  • subpicture related syntax (JVET-Q0397)

Bug fixes are outside the macro.

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