Merge branch 'gdr_decoder_fix' of https://vcgit.hhi.fraunhofer.de/jack.enhorn/VVCSoftware_VTM into gdr_decoder_fix

Fix call to initSEIScalableNesting

See merge request jvet/VVCSoftware_VTM!2027

Add decoded picture hash SEI writing for subpictures in subpic merger app

See merge request !2024

Fix #1468: bugfix parcat: remove duplicate prefix sei for IDR

See merge request jvet/VVCSoftware_VTM!2023

Fix #1467: Replace std::sort() with std::stable_sort() to avoid cross-platform performance mismatch

See merge request !2022

Fix #1464: Non-conforming values of sn_subpic_id_len_minus1

See merge request !2021

Fix #1465: skip mixed nalu leading pictures when beginning a stream

See merge request !2019

Fix #1466: fix check on SPS virtual boundaries constraint.

See merge request jvet/VVCSoftware_VTM!2020

Fix #1459: Modify ALF AVX2 code from JVET-U0103

See merge request jvet/VVCSoftware_VTM!2017

Enable processing of low bit depth content with JVET_U0103_HIGH_BIT_DEPTH_SIMD

See merge request jvet/VVCSoftware_VTM!2016

Fix for ticket #1458: printout wPSNR for hbd ctc

See merge request jvet/VVCSoftware_VTM!2012

Fix: #1460: init MTS coeff Constraint in MTS loop during Intra Search

See merge request jvet/VVCSoftware_VTM!2013

JVET-U2018: Update sequence configuration files

See merge request jvet/VVCSoftware_VTM!2015

Fix compilation when JVET_R0351_HIGH_BIT_DEPTH_ENABLED is set to 1

See merge request jvet/VVCSoftware_VTM!2014

Cleanup: fix return type of PPS::getMixedNaluTypesInPicFlag

See merge request jvet/VVCSoftware_VTM!2011

Return bool since variable is a boolean. Also fix use of returned
values.

Fix #1457: rplIdx variable for list 1 is not always set in parseSliceHeader()

See merge request jvet/VVCSoftware_VTM!2010

Fix #1456: Incorrect DPB flush when mixed NALU types is enabled

See merge request jvet/VVCSoftware_VTM!2009