Add Oxford comma to text/footcites

[wfmackey]

Request from Paul and Greg.

[MattCowgill]

I had to write a function called paulify_industry() for the shutdown report - it adds an Oxford comma and sentence case capitalisation

[HughParsonage]

Should be simple matter of choosing \PassOptionsToPackage[language=american]{biblatex} or \newcommand{\creflastconjunction}{, and\nobreakspace}