[Issue 17708] Escape control characters in std.conv.to error messages

[d-bugmail at puremagic.com]

https://issues.dlang.org/show_bug.cgi?id=17708

berni44 <bugzilla at d-ecke.de> changed:

           What    |Removed                     |Added
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                 CC|                            |bugzilla at d-ecke.de

--- Comment #2 from berni44 <bugzilla at d-ecke.de> ---
Which controll characters need escaping? 0x00 - 0x1F only? Or are there more of
them I'm unaware of?

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