Partially implements pps.
Add slice header parser.
Fix wrong parameter read.
Now start to add CABAC context.
change some data structure.
Add CABAC initialization for I picture.
Update data types to implement SAO parser.
Now both H.264 and H.265 shares same CABAC engine.
Start implementing quad tree structure.
Add split_cu_flag a bit.
Change quad-tree parser a bit.
Change bit mapping of split_cu flags.
Add intra elements.
Fix intra prediction mode.
Change data format of neighbour blocks.
Add implementation of CBF
Add multi-bit bypassing of CABAC.
Add first residual decoding.
Add scan order indices.
Add residual decoding a bit.