Fix long-term reference picture issues.

Brian Hengrequested to merge
bheng/VVCSoftware_VTM:ltrp_issues into master
  • Some LTRP may not be marked in checkThatAllRefPicsAreAvailable( ) after Fix for Ticket 891, so adding LTRP marking to applyReferencePictureListBasedMarking( ) as well.
  • Fix for LTRP delta POC MSB when there are STRP between two LTRP.

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