fix parcat after recent HLS integrations

Karsten Suehringrequested to merge
ksuehring/VVCSoftware_VTM:parcat_sh_fix into master

parcat has own functions to parse NAL unit header and slice header until POC. Those need updating after related HLS implementations (JVET-O0181, JVET-O0179)

Changes:

  • slice header syntax
  • NAL unit header in parcat
  • NAL unit type numbers being redefined

Initial testing shows that this works now

Edited by Karsten Suehring

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