Draft: Intrapred refactoring

Jonathan Gan requested to merge jgan/ECM:intrapred-refactoring into master

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.

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