~jaro/balkon

ref: 9e3b0ec7fd4a92e3d2dba81cd00dadc4dfe4006c 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.