Draft: Intrapred refactoring
Proposed refactoring of intra luma pred mode. In this refactoring the current intra prediction mode is tracked by a CABACReader/CABACWriter member variable m_IntraLumaPredMode which is an enum of type IntraLumaPredMode. Then, rather than checking the flags of incompatible prediction modes to determine whether a prediction mode is signalled, the value of m_IntraLumaPredMode is checked.