Fix issues with placement of menclose notations. (mathjax/MathJax#2571) #660
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This PR improves the placement of horizontal and vertical strikes and arrows, and makes sure diagonal arrows fit the actual box used. This addresses the issues in mathjax/MathJax#2571, but we don't fully follow the spec, since we do allow notations to affect each other (e.g., top by itself and top with right will be different width.
The PR also adds a couple of new types for some arrays that are used.
Resolves issue mathjax/MathJax#2571 (for now).