Making incremental changes to incentivize the clearing of three or more layers
at once. For now added new field in inner class BlockPlacementStrategy.Move,
named 'threePlusLayersCleared'. Reduced SUPERMAXIMAL_EVAL_SCORE to 10.4
because we're expecting to define THREE_LAYERS_CLEARED_SCORE_BOOST as 0.3, and
the sum of the two will be 10.7, which is still allowable.
