Monster commit that I can't face splitting

Included in this is:
 * switch to xetex because lualatex won't find my fonts
 * use better fonts
 * add the poker.sty package from [here][poker.sty]
 * add sections and make a start on actual content

poker.sty: http://www.encke.net/UpDownload-req-viewdownloaddetails-lid-23-title-poker.sty...LaTeX.Poker.package.v0.81a.html
Change short date name
Finish rules explanation and add cards