Have toString show escape code for \u{0001}

[rhofour]

Consider the following string
x = "a\0b\1c"
If typed on the repl it will display like this:

"a\0bc" : String

It looks like we lost the \1 character, but actually it's being printed directly (and not showing up since it's an unprintable character). This can be verified as follows:
String.toList (toString x)

['a','\0','b','','c'] : List Char

This doesn't seem like a great way to handle this. I don't know what the best way to handle this is, but doing something simple like also escaping non-null unprintable characters seems like it'd be an improvement.

This is all on 0.18.0.

One suggestion for how to handle this better is at elm-community/elm-test#225 .

[process-bot]

Thanks for the issue! Make sure it satisfies this checklist. My human colleagues will appreciate it!

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