Fix #1023: Mismatch of LMCS encoder and decoder for multiple slices

See merge request !1519

Fix encoder potentially trying to set subpicture ID vector, when subpictures are not signalled

See merge request !1523

Fix #1005: fix slice layout derivation

See merge request !1522

Avoid another copy operation for the subpicture class

See merge request !1524

Related to refactoring in !1512, after which ID vectors can only be set with the correct number of IDs.

Fix VB position computation in CC-ALF encoder

See merge request !1520

Fix issue #984: fix copy/paste error in writing of chroma deblocking filter parameters

See merge request !1518

Cleanup: restructure picture partitioning config files

See merge request !1521

- remove picture partitioning section from CTC file (so that they can be combined wit partitioning in any order)
- remove random access parameters from partitioning examples (combines well with AI or LD too)
- add examples for three slices with slice layout inference from subpictures and without
- try to make naming somewhat consistent

This issue was pointed out in JVET-R0322

Fix issue #1021 : Initialization for raster scan slices

See merge request !1517

Fix: Inference of sign data hiding flags in SPS

See merge request !1516