Put csl- prefixes in front of formatting attributes.
Use pandoc plain writer for Plain output. Removed renderPlainStrict.
Changed BiblioData to use [FormattedOutput] rather than [[]].
Removed renderPandoc_.  Whole package compiles, but lacks functionality.

The FormattedOutput is just passed through unprocessed.
We need to process it to handle prefixes, suffixes, formatting,
titlecase, etc.