~jaro/balkon

ref: 72076d17d2d2d6a0db54aa168366fa9a6ab646e0 balkon/test/Data/Text/ParagraphLayout/Plain d---------
Test ultra narrow Arabic text.
Deprecate the Plain interface.
Add user data to spans.
Qualify Plain interface.
Future-proof records with options.
Qualify Plain ParagraphData.