~jaro/balkon

Fix documentation: references to non-imported names.
Fix documentation: references to local names.
Properly configure Haddock documentation.
Separate internal plain Paragraph/ParagraphLayout.
Clarify changelog.
Expose text slicing functions.
Decompose text slicing.
Integrate BiDi reordering.
Implement BiDi resolved level reordering.
Bump version to 0.3.0.0.
Represent lines with non-empty lists.

We can do this because we removed lines with zero size.
Remove lines with zero size.

These lines would otherwise affect line numbering.
Do not re-export through the Plain module.
Move paragraphSpanBounds to the correct module.
Clarify comment about BiDi.
Correct comment about fragmentation.
Fix style: long lines.
Fix style: small Prelude imports.
Fix style: external vs internal imports.
Fix style: unnecessary do notation.
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