~jaro/balkon

ref: a42dd23609b364bf2e4375d8205c1623e4155522 balkon/test/Data/Text/ParagraphLayout/Internal/BiDiLevelsSpec.hs -rw-r--r-- 3.0 KiB 
Improve BiDi handling of numbers and neutrals.

Add tests for mixed text direction.

Convert legacy span directions into levels.