When adjusting cues with `snapToLines=false`, first we would generate an array with all different axises which we would use to move cue on the specific direction.
However, for the different writing directions, we should have different priority for the moving directions.
For example, if the wriring direction is `horizontal`, which means cues will grow from the top to the bottom, then moving cues along the `y` axis should be more important than moving cues along the `x` axis, and vice versa for those cues growing from the left to right, or from the right to the left.
After decided the moving direction, then we have to decide the moving offset. Now we use line box's Bsize as a basic moving unit.
Moving cues, however, by such as large distance as a time would cause too many redudant space between cue boxes, which doesn't provide a good enough visual arrangement result. Therefore, we divide the Bsize by a factor, which can control the granularity of the moving unit and can still preverse a reasonable space between boxes. That can provide way better visual result than the one we had used before, and still has certain good performance comparing with moving 1px at a time.
Differential Revision: https://phabricator.services.mozilla.com/D41131
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extra : moz-landing-system : lando
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