array depth template

[Saaa]

> It's kind of the right idea, but.. it's also kind of weird.
>
> template ArrayDepth(T: T[]) { const ArrayDepth = 1 + ArrayDepth!(T); }
> template ArrayDepth(T)       { const ArrayDepth = 0; }
>
> This lets you get the depth of any array _type_, like
> ArrayDepth!(int[][]) gives 2.

Although I don't fully understand your code, I think I modified it correctly 
to get the base type of an array :)

template BaseType(T: T[]) { const BaseType = BaseType!(T); }
template BaseType(T) {const BaseType = T; }