Create a rebus RStudio addin

[richierocks]

Create a package with useful regex-related RStudio addins. For example, insert %R% into the document.

insertROperatorAddin <- function () 
{
    rstudioapi::insertText(" %R% ")
}

and inst/rstudio/addins.dcf

Name: Insert %R%
Description: Insert the %R% regex concatenation operator into a script.
Binding: insertROperatorAddin
Interactive: false

See https://github.com/jennybc/jadd and https://rstudio.github.io/rstudioaddins