otp: add bidi scanner

[kikofernandez]

addition of bidi scanner and fix of invisible unicode from when
Erlang/OTP translated XML to markdown.

[github-actions]

CT Test Results

    3 files    142 suites   49m 35s ⏱️
1 652 tests 1 596 ✅ 56 💤 0 ❌
2 374 runs  2 299 ✅ 75 💤 0 ❌

Results for commit 5cf8b4c.

♻️ This comment has been updated with latest results.

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[RaimoNiskanen]

The removed characters are SIX-PER-EM-SPACE:s (U+2006), that I would like to be kept as they were.

[RaimoNiskanen]

I got that wrong. They are ZERO WIDTH SPACE (U+200B)