~jaro/balkon

ref: c9c57b600e59c89dc1f4831c5df03c8cf4725056 balkon/.golden/loremIpsum20em d---------
Add ignored prefixes and suffixes to test data.

This ensures that implementation does not rely on the texts having zero
offset inside their byte arrays.
Use ICU to find line break boundaries.
Implement line breaking on code point boundaries.