Stricter parsing of string_continue escapes in cooked string #392
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This PR ports dtolnay/syn#1381 from syn's literal parser to proc-macro2's literal lexer.
Before this PR,
"b\"\\\n\u{a0}\""would parse successfully as a byte string literal token. The trailing backslash would skip over all following Unicode whitespace, including the non-breaking space codepoint. This behavior was incorrect. Trailing backslash is only supposed to skip over ASCII space,\t,\n, and\r\n. Non-ASCII codepoints such as nbsp are not allowed in the representation of a byte string literal.