[texhax] Before and After Display Hooks

[Vafa Khalighi]

There is \everydisplay primitive but how can you have something before
display and something after display. I mean can you define
\beforeeveryDisplay and \aftereverydisplay hooks? See this example:

start
$$1+2=3$$
end

So I could have
\beforeeverydisplay{start}
\aftereverydisplay{end}
$$1+2=3$$

\beforeeverydisplay and \aftereverydisplay works for every single display
just like how \everydisplay works.
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