~dricottone/pkgbuilds

ref: a91c61080dc18c3d828a19825d3dc9387945f2b1 pkgbuilds/r-rcpp 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.