CRAN v0.3.0

This release makes substantial changes to how bibliographies included in a
document. The package now uses pandoc-citeproc for handling bibliographies,
rather than biblatex and the RefManageR package (partly due to CRAN archival).
This is more consistent with how bibliographies are generated in other rmarkdown
documents, and importantly it now allows custom CSL formats to be used (the most
common request). Another advantage of this change is that non-bib citation
formats can now be used (including YAML and CSL-JSON), and that changes to the
table are directly applied to the resulting bibliography output.

The same bibliography_entires("/path/to/file.bib") interface
applies, however the result may now differ slightly:

1. The column names and structure of the intermediate tibble has been changed to
   better align with the CSL-JSON format used by pandoc. This allows the
   modified contents of the tibble to be correctly reflected in the resulting
   output.
2. The default style of the bibliographies is now the APA CV format, which is
   similar but not identical to the previous default. This should be easier
   to customise now by providing a custom CSL (much like any other rmarkdown
   document).

Another advantage to moving to use pandoc-citeproc for bibliographies is that
templates for other output formats (like HTML and Word) can now be added.

More details can be found here: https://pkg.mitchelloharawild.com/vitae/reference/bibliography_entries.html

Breaking changes

• The startlabel and endlabel arguments of bibliography_entries() are now
  defunct.
• The column names and structure of the bibliography_entires() tibble have
  changed for consistency with the CSL-JSON format. The mapping of commonly used
  column names are:
  • bibtype -> type (note that the values are converted to CSL-JSON format)
  • key -> id
  • year -> issued
• The default style of bibliography entries is now the APA CV format, which has
  been modified to match the order of the tibble, rather than the default of
  reverse chronological order. This bibliography style can be customised using
  the csl argument in the yaml front matter.

Improvements

• bibliography_entries() are now handled using a pandoc's cite-proc. This
  means that typical approaches for specifying CSL and other citeproc parameters
  will work as expected.
• The citation_package and latex_engine options are now changeable by users
  for all output formats.
• The why argument of detailed_entries() can now optionally be provided as a
  list of characters.