~jaro/balkon

ref: fffb8325acf5c5778937c26c792cb40aed7bc788 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.