Add a description of ChromaTS into the software manual.

JVET-P0983/P0391: remove sps maximum sbt size flag: add configurable parameter to use 64 size SBT in encoder RDO

  - Unsafe use of reference picture PPS pointers.

- slice header syntax
- NAL unit header in parcat
- NAL unit type numbers being redefined

JVET-N0867: Added check to confirm that the GOP size and picture order fullfils the configured DetlaTimes. If not DeltaTimes in BP and picture Timing are not used.

JVET-O0236 Removal of a parsing dependency

  - Add macro for code changes.

The fix was confirmed as part of the specification.

 The following fixes has been made:

   - Removed prefixes like 'i' for new variables

   - Adding braces also for if-clauses with a single statement

   - Removed some trailing spaces

   - Changed variable precedingDRAP in Picture from int to bool

Update cfg file for rasterscan slice

Implement option B for NAL unit header syntax.
NOTE: Neither the JVET-O0129-v2 or the JVET-O2001-vEJVET-O2001-vE documents specify a nal unit type NAL_UNIT_VPS, and this nal unit type is required. In this implementation NAL_UNIT_VPS is defined to be 25.

 Implementation of the Dependent RAP indication SEI message. Pictures are marked as DRAP pictures using the encoder config parameter DRAPPeriod, which sets DRAP pictures periodically. Conformance checks are performed at the decoder side to verify that the DRAP pictures follow the constraints in the VVC specification.