Add wrap argument to output helpers

[pat-s]

Following our discussion in the Slack group a few weeks ago.

Feel free to adjust the file contents or rename to your liking.

[codecov-io]

Codecov Report

Merging #37 into master will decrease coverage by 0.41%. The diff coverage is 60%.

@@            Coverage Diff             @@
##           master      #37      +/-   ##
==========================================
- Coverage   79.91%   79.49%   -0.42%     
==========================================
  Files          49       49              
  Lines         667      673       +6     
==========================================
+ Hits          533      535       +2     
- Misses        134      138       +4

Impacted Files	Coverage Δ
R/printf.R	60% <60%> (-40%)	:arrow_down:

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[pat-s]

ping @mllg

[mllg]

I included the wrap stuff in the already existing helpers because I think we want to combine it with sprintf().

[pat-s]

Sounds good, thanks.