Remove staticIota: std_experimental_typecons

[wilzbach]

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[dlang-bot]

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[JackStouffer]

static foreach?

[wilzbach]

It is just used to generate a string which is mixin-ed later anyways.
We could also convert args to a non-templated function, which is probably a bit faster.

[MetaLang]

I don't feel that it makes a huge difference so I'm gonna merge.

EDIT: pending auto-tester.

[PetarKirov]

Always prefer runtime foreach (when possible - e.g. CTFE), as the compile-time/tuple/AliasSeq foreach and static foreach copy the AST of the loop body for each loop iteration, thereby making the compilation slower and requiring more memory.