LaTeX writer: use `cslreferences` environment for csl bibliographies.

this allows bibliographies to receive special formatting.

The template now contains definition of this environment (enabled
only when CSL is used).

It also defines a `\cslhangindent` length.  This is set to
2em by default when the bibliography style specifies
a hanging indent.  To override the length, you can
use e.g.

\setlength{\cslhangindent}{7em}

in header-includes.

Closes jgm/pandoc-citeproc#410.

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