~dricottone/pkgbuilds

ref: e41bc4b26c0b7ce34e68c291670c30aa067c9990 pkgbuilds/r-xml2 d---------
Initial commit

A long journey to packaging r-tidyverse. The current highest-level
packages that are successfully built are dtplyr, waldo, callr, and xml2.
A handful of others (brio, digest, praise, units, zeallot) are currently
freestanding but will become dependencies soon.