Clean-up of 2 parts in the ISP code that are redundant

See merge request jvet/VVCSoftware_VTM!297

Clean-up of 2 parts in the ISP code that are redundant. The changes do not alter the performance in any way, i.e., the results are exactly the same.

1) In the full RD intra mode tests loop (estIntraPredLumaQT) there is the following condition:
    if ( uiOrgMode <= DC_IDX ) -> do X; else-> do X.
Since X is the same in both cases, the redundant code has been removed.

2) In xRecurIntraCodingLumaQT there is the threshold definition

double threshold = nSubPartitions == 2 ? 0.95 : subTuCounter == 0 ? 0.67 : subTuCounter == 1 ? 0.83 : 0.91;

Since subTuCounter can never be 0 (it is at least 1) at the time this expression is evaluated, the code has been simplified in the following way:

double threshold = nSubPartitions == 2 ? 0.95 : subTuCounter == 1 ? 0.83 : 0.91;

Remove reference to SPSNext to avoid compilation error

See merge request jvet/VVCSoftware_VTM!295

Align ALF syntax element trace with specification

See merge request jvet/VVCSoftware_VTM!293

Ticket 149 fix

See merge request jvet/VVCSoftware_VTM!291

Fix for Ticket #152

See merge request jvet/VVCSoftware_VTM!285

  - Sub-PU TMVP can generate an invalid inter candidate.
  - Simplify previous solution and eliminate duplicated code.

Fix for ticket #168: Interaction between M0140 (SBT) and M0297 (MTS Zero Out)

See merge request jvet/VVCSoftware_VTM!288

Fix #178 Avoid referencing encoder parameter in low level MC function

See merge request jvet/VVCSoftware_VTM!290

Fix of the DQP signaling with multiple TUs (Ticket #181)

See merge request jvet/VVCSoftware_VTM!280

When MC for luma only is desired, use existing luma/chroma parameters
instead of encoder-specific field in data structure

Also take care that luma only MC doesn't imply IBC

Fix for Ticket #150

See merge request jvet/VVCSoftware_VTM!284

#179: fix of reshaper implementation (encoder-side RDcost) when lumaDQP is on for HDR

See merge request jvet/VVCSoftware_VTM!269

Fix for Ticket #182

See merge request jvet/VVCSoftware_VTM!289

  - Fix overflow during reconstruction process.

- The M0297 zero-out is also supported for SBT now.
- The zero-out scanning code is moved out of residual_coding_subblock.

SPS cleanup - removal of deprecated SPSNext parameters

See merge request jvet/VVCSoftware_VTM!279

Fix for tickets #91 and #180

See merge request jvet/VVCSoftware_VTM!275

Fix for ticket #179 Retrieval of QP value to use for chroma

See merge request jvet/VVCSoftware_VTM!271

Deleted the TU retrieval from the DQP code in xCompressCU and the TU pointer being equal to nullptr check.

  - Sub-PU TMVP can generate an invalid inter candidate.

  - Triangle merge list zero-MV candidates not properly initialized.

Fix of the DQP signaling when there are multiple luma TUs in Single Tree and there is only one TU containing all of the chroma information

avoid dereferencing a nullptr object

See merge request !276

MSVC minimum version and clang identification

See merge request !277

Update ALF syntax element with specification

See merge request !278

- fail to build when MSVC version too low
- properly identify clang as compiler

Dereferencing a nullptr should be avoided, even if the passed object is never used.
It may not be the most elegant solution to pass an empty list object, but it should work.

enable JVET-L0283 MRLP

See merge request !272

Fix ticket #177 on encoder decoder mismatch for VTM-4.0rc1

See merge request !273