JVET-O0189: Implementation of decoding unit (JVET_O0189_DU)
Enhancement on general_hrd_parameters() by adding encoder parameter 'HrdParametersPresent' (FIX_HRD_O0189) Removal of not-yet-adopted syntax elements in Buffering Period SEI (FIX_SEI_O0189) Rebased to resolve conflict with JVET_OO152_BP_SEI_GDR