fix: replaceLinebreakInString bug with double newlines

[edongashi]

Replaces regex with a simple state machine.

Since there is no test infrastructure, I ran the following snippet for a sanity check:

console.log([
  "Line1\\Line2",
  "Line1\\\\Line2",
  "Line1\\tLine2",
  "Line1\\nLine2",
  "Line1\\n\\nLine2",
  "Line1\\n\\\\nLine2",
  "Line1\\n\\\\\\nLine2",
].map(replaceLinebreakInString).join('\n======\n'))

And got:

Line1\Line2
======
Line1\Line2
======
Line1\tLine2
======
Line1
Line2
======
Line1

Line2
======
Line1
\nLine2
======
Line1
\
Line2

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Name	Status	Preview	Updated (UTC)
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