New Free module, with pure versions of IO funcs

Introduce a new module, Text.Pandoc.Free, with pure versions, based on
the free monad, of numerous IO functions used in writers and
readers. These functions are in a pure
Monad (PandocAction). PandocAction takes as a parameter the type of
IORefs in it. It can be aliased in individual writers and readers to
avoid this parameter.

Note that this means that at the moment a reader can only use one type
of IORef. If possible, it would be nice to remove this limitation.

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