Fix #1649 on rprConstraintsActiveFlag

See merge request jvet/VVCSoftware_VTM!2772

Fix #1645 on sbtmvp enabling condition in CU-level in case of multilayer profile.

See merge request jvet/VVCSoftware_VTM!2768

Fix #1646 on the condition of using tempMV for SbTMVP

See merge request !2769

JVET AI0061 Proposal 1: signal a NNPFC prompt for spatial extrapolation

See merge request !2773

JVET-AG0322: Modality Information SEI

See merge request !2765

# Conflicts:
#   source/Lib/CommonLib/TypeDef.h

Fix #1647 on adding HMVP candidates to AMVP list (multilayer with >2 layers)

See merge request !2770

Clean up unregistered user data SEI

See merge request !2777

Fix #1643 on different pps.conformanceWindows when using --UpscaledOutput=1 with RPR

See merge request !2767

JVET-AI0061-PROPOSAL2: Ensure spatial extrapolation works correctly (Option 1)

See merge request !2774

JVET-AI0059: Define persistence scope for text description information SEI to be purpose specific

See merge request !2766

Workaround for VLCReader::xReadString for Visual C++

See merge request !2775

The current code misses the first character of the string for some reason. Maybe a compiler problem.
Using a local variable fixed this.

this should fix ticket #1643

optimization of RdCost::getWeightedMSE() in case of constant weight

See merge request !2763

# Conflicts:
#   source/Lib/CommonLib/SEI.h

JVET-AI0153: Object Mask Information SEI

See merge request jvet/VVCSoftware_VTM!2752

add MS-SSIM2 for multilayer with reference layer (scalable)

See merge request !2762

Add NNPFC SEI message support of spatial extrapolation in JVET-AH0174 and JVET-AI0202.

See merge request !2757

This reverts commit 759a20a7.

Move macro definition into appropriate location

See merge request jvet/VVCSoftware_VTM!2764