Deprecate ParagraphConstruction.

Deprecate the Plain interface.

Add public Rich interface.

Add user data to spans.

Add line numbers to laid out fragments.

Qualify Plain interface.

Future-proof records with options.

Fix documentation: missing Paginable.

Separate internal plain Paragraph/ParagraphLayout.

Expose text slicing functions.

Fix style: white space in exports and imports.

Prepare pagination for future layout types.

Add paragraph pagination.

Better format ParagraphConstruction documentation.

Separate module for the ParagraphLayout type.

Remove (~) operator from ParagraphConstruction.

The tilde operator was causing compilation errors with older versions
of GHC, possibly due to a conflict with the lazy pattern match syntax.

It has been replaced by a pure Haskell alternative that uses function
application.

Make SpanOptions a separate type.

Slightly decompose the Plain module.

Update documentation and derived instances.

Expose ParagraphConstruction.