JVET-Q0787: Bug fix for subpicture width and height signalling

See merge request !1278

JVET-Q0503/JVET-Q0712: Encoder only improvement and fix for palette mode

See merge request jvet/VVCSoftware_VTM!1279

JVET-Q0503: encoder only improvement (4 items) of palette mode
JVET-Q0712: fix palette encoder issue at high QPs. Fix on top of the optimized table in JVET-Q0503.

Fix #840: Use proper source buffer when boundaries are present

See merge request !1280

JVET-Q0806: Geometric partitioning mode

See merge request jvet/VVCSoftware_VTM!1268

JVET-Q0156: Enable inter-layer prediction for STSA pictures

See merge request !1247

fix the interaction between JVET_Q0784_LFNST_COMBINATION and JVET_Q0820_ACT/JVET_Q0695_CHROMA_TS_JCCR

See merge request !1274

Fix Cross Component Alf APS activation after !1258

See merge request !1276

Fix access to unitialized memory in xActivateParameterSets()
Allow change of CC Alf aps_id between slices

Avoid out of bounds access in deriveOutputLayerSet

See merge request jvet/VVCSoftware_VTM!1234

JVET-Q0775: Enable signalling of picture header in slice header

See merge request jvet/VVCSoftware_VTM!1255

fix the interaction between JVET_Q0784_LFNST_COMBINATION and JVET_Q0820_ACT/JVET_Q0695_CHROMA_TS_JCCR

JVET_Q0297: Merge estimation region

See merge request !1270

JVET-Q0501: Palette predictor initialization from above CTU row in WPP

See merge request jvet/VVCSoftware_VTM!1271

JVET-Q0820: ACT bug fixes and reversible ACT transform

See merge request !1265

Fix uninitialized memory access in PPS::initSubPic() after !1236

See merge request !1269

Add inferrence of subpic parameters when sps_subpic_present_flag == 0

Force the decoding of all layers when TargetOutputLayerSets is not set, or when only one layer is present in the VPS.

JVET-Q0795: Cross-component ALF

See merge request !1258

JVET-Q0806 Geo related adoptions (JVET-Q0059, JVET-Q0077, JVET-Q0123, JVET-Q0188, JVET-Q0242_GEO, JVET-Q0309, JVET-Q0365 and JVET-Q0370)

BDPCM Chroma syntax is disallowed to signal when ACT is enabled for CU.
Decision(BF/SW): Adopt JVET-Q0353 method 1.

JVET-Q0695: Enabling the RD checking of chroma transform-skip mode for JCCR at encoder

See merge request !1260