Hiromi Ishii 6f1661f7da Implements \mathchoice command (#969) ...

This PR implements `\mathchoice` function.
I once created PR on the wrong branch. Sorry for the mess.

This is particularly useful when one defines custom macro for "big operators".
For example:

```latex
\newcommand{\infdisj}{%
  \mathop{%
    \mathchoice{% display
      \bigvee\hspace{-2ex}\bigvee%
    }{          % inline
      \bigvee\hspace{-1.75ex}\bigvee%
    }{          % script
      \bigvee\hspace{-1.4ex}\bigvee%
    }{          % scriptscript
      \bigvee\hspace{-1ex}\bigvee%
}}}
```

2017-11-22 07:34:05 -05:00

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