Add a enable/disable switch for using segmantation
By default, segmentation is turned off. Note that there is an existing similar flag 'segmentation.enabled' under SegmentationState struct under TileState, and the new one from this commit is the master switch and later will be controllable by CLI. By not using any segment, this temporarilly fixes the ongoing desync issues caused by quantizer rdo and heuristic quantizer choice at speed 0,1,2.
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