Clean up code related to BP SEI

Frank Bossenrequested to merge
bossen/VVCSoftware_VTM:clean-sei-bp into master

Includes:

  • fix syntax element names for tracing
  • add validation checks
  • move validation check to correct place
  • define enum HrdType for indexing by NAL or VCL
  • consistently use bp variable name for BP SEI objects
  • use static_vector instead of having separate variable for array size

Merge request reports