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Lua: use proper interface functions to access the CommonState.
Error messages: use single quotes around paths and format names.
Lua: support custom bytestring readers.
Add test for custom bytestring writers
Lua: rename `reader_extensions`/`writer_extensions` globals...
Support complex figures. [API change]
[API Change] Extract Lua code into new package pandoc-lua-engine
Lua: support `-D` CLI option for custom writers [API change]
Markdown reader: ordered sublists must start with 1