~dricottone/pkgbuilds

ref: b2879491fd9f7fb01c5fb69751685e9966ea05dc 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.