- don't use SPS in PPS parsing/writing
- create a function for decoder parameter set consistency checks
- fix bug with JVET-Q0413 subpicture parsing changes
- may contain traces of coding style fixes

Implementation of JVET-Q0468 support of min Luma coding block size, and JVET-Q0469 for Intra Chroma Min QT bug fix

Modified SAO for 12 bit coding.
Also removed SAO offset from the HEVC RExt PPS extension.
The HEVC RExt PPS extension and the associated
cross-component-prediction should be removed in the future

Implementation of JVET-Q0468 support of min Luma coding block size, and JVET-Q0469 for Intra Chroma Min QT bug fix

Implementation of JVET-Q0468 support of min Luma coding block size, and JVET-Q0469 for Intra Chroma Min QT bug fix

   - Extend "RefPicIsScaled" logic to cover corner cases where the scale factor is 1:1, but the scaling window offsets are not aligned.
   - Specify scaling window offsets in units of SubWidthC and SubHeightC pixels.