JVET-N0805: APS for LMCS (using different APS types)

See merge request !577

Software implementation for N0278:
1. Added VPS encoding in encoder
2. Add new project StreamMergeApp to N-to-1 bitstream merge
3. Changed decoder to support only decoding the specified layer stream

Nan Hu authored 5 years ago and Karsten Suehring committed 5 years ago

move m_fixedFilterNum to CommonDef.h, rename bRdo and bRedo to isRdo and isRedo, remove redundant stat derivation.

- tiles are in the VVC spec for 3 meeting cycles now
- cleanup helps with adaptation for tiles to current draft

- remove duplicate ALF parameters from Slice
- add activation (to avoide overwriting when a new APS arrives)
- rename macro

There is a conflict with JVET_M0427_INLOOP_RESHAPER that is triggering a debug assertion that checks that the width is not 1.

switched default value for CodingStructure::initStructData::QP from -1 to MAX_INT (signalling that the QP value for the CS should not be set)