Separate chunks within Rmd and Rnw contents
Identifies and separates the code and text chunks (the latter includes non-R code) within an Rmd or Rnw file, and returns these separately.
separate_chunks(lines, filetype)
| lines | A character vector of lines from an Rmd or Rnw file. | 
| filetype | A string indicating the filetype - either 'Rmd' or 'Rnw'. | 
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