Bug 23457 – std.string.wrap has no policy on how it counts columns

There's no hint in documentation of `std.string.wrap` whether it counts the columns by code unit or by code point. Moreover, the function does not even settle on one or the other. Example: ```D // €€ €€ // €€ // wrap("€€ €€ €€", 18).writeln; // €€ €€ €€ // wrap("€€ €€", 18, "€€ ").writeln; ``` These both should print the same result. While either result will do, I'm inclined to think the result should be the one with all '€':s in the same line. The purpose of the function is to fit characters in a certain space, and characters take the same amount of space regardless of encoding.

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