JVET-AD0054 item 3: NNPF interpolated pictures constraint

See merge request !2636

fix RPL with inter-layer references

See merge request !2633

Add encoder parameter WriteVuiHrdFromY4m

See merge request jvet/VVCSoftware_VTM!2634

JVET-AD0057 item 1: Allow inclusion of NNPFC and NNPFA SEI messages in suffix SEI NAL units

See merge request !2631

JVET-AD0388: add nnfpa_num_output_entries and nnfpa_output_flag syntax elements

See merge request !2627

JVET-AD0057 item 2: disallow the post-filter hint SEI message to be present in both a prefix SEI NALU and a suffix SEI NALU in the same picture unit

See merge request !2632

JVET-AD0057 items 3 and 4: Update VclAssociatedSeiList and PicUnitRepConSeiList

See merge request !2630

JVET-AD0057 item 2: disallow the post-filter hint SEI message to be present in both a prefix SEI NALU and a suffix SEI NALU in the same picture unit

Fix #1604: NNPFC constraints check

See merge request !2628

JVET-AD0057 item 6: multi-picture-input constraint

See merge request !2629