Updates in BibLaTeX preamble

In some cases, users of the template may not need the other template
headers, they may only want `preamble-biblatex.tex'. But `xcolor' needs to
be loaded before being able to load the various colors we use in the
references. So to be self-consistent, it is loaded.

Also, the default style was also printing the month of the publication
which is not common. So a line was added to clear the `month' field before
building the Bibliography.

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