Add support for ' (thousands separator) for Printf

Printf, even after the (very nice) rewrite, does not support the ' thousands separator flag (it is a GNU extension).
Would a PR adding that be accepted? It’s very nice funcionality to have in practice.


There was a thread recently:

It’s not about printf so maybe you like it anyways.

I don’t see any reason why it shouldn’t be accepted in general, but I think that these things always depend on the PR.

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I just didn’t want to waste any time to write up a PR, unless it looked like people were interested in having this GNU extension added.

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