[openstreetmap-website] Usernames are not XML-char safe (#759)

[Tom Hughes]

I've blocked the byte order markers as well now, in 0cc579b2875a1f31d4425cc90378fd8cbf934974.

The only other thing we should be blocking is surrogates, but ruby literally won't let you write them as a range, presumably because it insists on them appearing as a valid pair which it would then decode into a single codepoint, so it's likely it will do the same if receiving them from the network.

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https://github.com/openstreetmap/openstreetmap-website/issues/759#issuecomment-46507475
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