txtar: add CRLF handling

[bsponge]

• added handling of CRLF
• Format will use the same line separator as the one used in the comment or (if the line separator is not found in the comment) in the files
• Parse will use the same line separator as the one found before the first occurrence of a file marker
• added a test case with mixed line separators

Fixes golang/go#59264

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Patch Set 17: Run-TryBot+1

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