liftSaddleTo

Scales the mob so its saddle, the seat a vanilla rider steers it from, lands on the given seat bone at the model's rest pose: the bone's Blockbench origin, in blocks from the model's feet, at the model's own scale. A live bone position would depend on whether the model clock has posed the skeleton yet and on the animation playing. The model leaves that scale out and keeps its size. Does nothing when the server cannot report the saddle height.