Remove the use of triple colon operators

[nanxstats]

From the R CMD check, I see

* checking dependencies in R code ... NOTE
Unexported object imported by a ':::' call: ‘r2rtf:::as_rtf_new_page’
  See the note in ?`:::` about the use of this operator.

Since r2rtf:::as_rtf_new_page() is simply defined as:

function () paste("{\\pard\\fs2\\par}\\page{\\pard\\fs2\\par}")

To eliminate the note, you can either 1) export it in r2rtf or 2) copy it as an internal function to this package.

[elong0527]

I typically handle this issue following https://stackoverflow.com/questions/63023526/unexported-object-imported-by-a-call-tsfeaturesscalets.

I would suggest to address this NOTE while we preparing CRAN submission.

[nanxstats]

I having a mixed feeling about the getFromNamespace() trick mentioned in the SO answer. Feels to me it's not a permanent solution and can be even harmful: it can easily break the package once the upstream private API changes. 🤔

But I do agree this can be handled later when appropriate.

[elong0527]

The dependency has been removed. Closing the issue.