[mlpack-git] [mlpack/mlpack] use constexpr to replace static const (#612)

[stereomatchingkiss]

>I think, it would be reasonable to use constexpr if the initialization is time-consuming at runtime or if we could evaluate an expression at compile time. But that's not the case here

I have different opinion about this one, I think it is reasonable to change it from const to constexpr because

1 : It may(not will) help the compiler generate better binary, smaller and faster
2 : It is not premature optimization, because changing from const to constexpr do not seem like adding any burden on the programmers

These are what I think about, just take it as reference.

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