~jaro/balkon

ref: ba1e5a040d130d35a16a7d9a0146cec41262cbff balkon/src/Data/Text/ParagraphLayout/Internal/Rich.hs -rw-r--r-- 3.1 KiB
Link ResolvedSpan to boxes.
Separate WithSpan for sharing with other modules.
Add basic support for Rich layout.