Fix #976: IBC virtual buffer reset for large CUs

See merge request jvet/VVCSoftware_VTM!1484

Fix #987: Avoid negative min_qp_prime_ts_minus4 values

See merge request jvet/VVCSoftware_VTM!1483

Revert "Merge branch 'fix_ticket_981' into 'master'"

See merge request jvet/VVCSoftware_VTM!1485

This reverts merge request !1475

- Clipping min_qp_prime_ts_minus4 to 0 at the low end
- Print a warning message when IntenalBitDepth is lower than InputBitDepth

Fix memory access issue in ALF SIMD code

See merge request jvet/VVCSoftware_VTM!1479

Issue flagged by address sanitizer. Happens when the picture height
is an integer multiple of the CTU height.
Memory buffer size is increased to avoid the issue.

Fix #980: CCALF rate estimation

See merge request jvet/VVCSoftware_VTM!1477

Fix Ticket #981: Mismatch when slice_ts_residual_coding_disabled_flag is enabled

See merge request !1475

JVET-P0118: HRD aspects

See merge request !1456

JVET-Q0289: rect_slice_flag signaling

See merge request !1478

Improved encoder configuration for Subpicture Level Information SEI

See merge request !1476

- new pattern: create a class to collect all parameters  related to this SEI
- existing code can be refactored to use the same pattern for grouping to avoid endless assignments

Note: fixes executable flags for some unrelated config files

JVET-Q0630: Parsing dependency fix for subpicture level info SEI

See merge request jvet/VVCSoftware_VTM!1474

Fix #978: HRD

See merge request jvet/VVCSoftware_VTM!1471

JVET-Q0399: Allow inference of scaling window from conformance window

See merge request jvet/VVCSoftware_VTM!1472

Note: The encoder automatically sets scaling and conformance windows and signalls them without specific config parameters. Thus also no config file option was added for the inference.

JVET-Q0237: STSA with TID Zero in Dependent Layer

See merge request jvet/VVCSoftware_VTM!1468

JVET-Q0219: Signal separate set of alternative buffering delay parameters

JVET-Q0218 (Proposal 3): Fix missing inference rule for single_slice_per_subpic_flag

See merge request jvet/VVCSoftware_VTM!1465

JVET-Q0257: Constraint expression to limit actual scaling ratios rather than the picture sizes

See merge request jvet/VVCSoftware_VTM!1463

Check that VPS is available in bitstream before accessing VPS
information in DecLib::checkSEIInAccessUnit

Encoder bug fix for HRD, whereby the CPB removal delay delta indexes for
temporal sublayers are disabled for the last GOP of the picture if it is
not a full GOP

JVET-Q0751: Constraints and properties of mixed nal unit types

See merge request jvet/VVCSoftware_VTM!1462

JVET-Q0218 Proposal1 : conditionally signal tile_idx_delta_present_flag in slice signalling

JVET-Q0346 aspect 2: scaling list used in sh

See merge request jvet/VVCSoftware_VTM!1457

JVET-Q0222: Modifications to subpicture information signalling

See merge request jvet/VVCSoftware_VTM!1455

JVET-O0397: Subpicture extraction process

See merge request jvet/VVCSoftware_VTM!1470

Functional stage: allows extraction of subpicture bitstreams that can be decoded. This includes:
- rewriting of tile structure
- rewriting of slice structure
- rewriting of picture dimensions

HRD related parts are not included yet