Remove {magrittr} pipes and {purrr} lambdas#436

Ilia-Kosenkov merged 8 commits intoextendr:mainextendr/rextendr:mainfrom

Ilia-Kosenkov:feature/Remove-pipes-and-purrr-lambdasIlia-Kosenkov/rextendr:feature/Remove-pipes-and-purrr-lambdasCopy head branch name to clipboard