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

See merge request jvet/VVCSoftware_VTM!280

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 !269

Fix for Ticket #182

See merge request jvet/VVCSoftware_VTM!289

  - Fix overflow during reconstruction process.

SPS cleanup - removal of deprecated SPSNext parameters

See merge request !279

Fix for tickets #91 and #180

See merge request !275

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

See merge request !271

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

  - 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

IBC block search history status is not reset for each frame, which may affect IBC searching results for the second frame.

Compiling error fix in IntraPrediction.cpp when JVET_M0102_INTRA_SUBPARTITIONS is disabled

See merge request !270

SW and spec mismatch related to wide angle #174

See merge request !260

remove SPSNext extension and sort SPS

See merge request !268

- all elements of SPSNext are moved into SPS
- syntax elements of SPS are sorted according to draft (as far as possible)
- comments were added where software and draft diverge

fix typo in tracing code

See merge request !267

fix IBC indication in reshaper and hash ME

See merge request !262

fix ENABLE_TRACING build

See merge request jvet/VVCSoftware_VTM!264

Keep align syntax-element variable with trace

See merge request jvet/VVCSoftware_VTM!261

- fix block statistics code for IBC mode after JVET_M0483_IBC
- enable build of block statistics code, when ENABLE_TRACING is specified on the command line

- removes old getIBCMode functions from SPSNext
- fixes references to this function in
  * reshaper
  * hash based ME

Note: SPSNext is going to be removed. Fixes can also be applied with the removal patch.