JVET-P0615: intra chroma mode coding cleanup

Bappaditya Rayrequested to merge
bray/VVCSoftware_VTM:JVET-P0615 into master

JVET-P0615: intra chroma mode coding cleanup (case 3: separate context for intra_chroma_pred_mode and cclm_mode_idx).

Edited by Frank Bossen

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