Includes:
- added flag
- minor updates for variable names
- update for trace strings according to JVET-R2001-vA

JVET-R0162 proposal1: change the signaling of wraparound offset to picture width minus wraparound offset

- fixes other style issues as well

   - Move wrap around offset from SPS to PPS.
   - Disable wrap around for any reference pictures that require RPR scaling.

Vadim Seregin authored 4 years ago and Frank Bossen committed 4 years ago

JVET-R0277 items 1 and 2: Modified condition for the number of active entries override flag, inference for slice_collocated_from_l0_flag

Assign correct default values (1) to collocated chroma flags in
SPS. Note that default values are used only for non-420 chroma formats.
Modify and clean up CCLM code to not unnecessarily rely on collocated
chroma flags for non-420 chroma formats.