JVET-P0667: Avoid signalling QP offset table for JCCR when it is disabled

See merge request !1066

Fix for Ticket #563 - RPR

See merge request !1050

JVET-P0347: Add check for Max MTT depth constraint

See merge request !1060

Fix for Ticket #560 - RPR

See merge request !1047

Fix for Ticket #568 - RPR

See merge request !1051

JVET-P0325: reorder the spatial merge candidates

See merge request !1057

JVET-O0549: Encoder-only temporal filter

See merge request !981

Fix for Ticket #562 - RPR

See merge request !1049

Fix for Ticket #569 - RPR

See merge request !1052

Fix for Ticket #571 - RPR

See merge request !1053

Merge branch 'JVET-O0549_ENCODER_ONLY_FILTER' of https://vcgit.hhi.fraunhofer.de/rickard/VVCSoftware_VTM into JVET-O0549_ENCODER_ONLY_FILTER

  - Fix multiplication overflow in scaled MV position.

  - Disable clipping of unscaled RPR motion vectors.

  - Disable sub-PU grouping optimization with RPR.

  - Interaction between RPR and BDOF.

  - Incorrect calculation of refHeight.

Changing variable names to not start with capital letter. Also replaced leading s_ with m_ for private, static member variables.

  - Unsafe use of reference picture PPS pointers.

JVET-P0081: Apply asymmetric long tap deblocking (1 + 3) filter at Horizontal Chroma CTB boundaries

See merge request jvet/VVCSoftware_VTM!1018

JVET-P0254: Fix number of luma mapping segments to 32 regardless of bit depth

See merge request !1016

I have confirmed that this modification can be consistent with the specification and there is no problem with the coding results.

Changing variable names to not start with capital letter. Also replaced leading s_ with m_ for private, static member variables.