Support colorization and pretty-printing as modular operations
The CLI could support accepting Rosie JSON as input, with one command to colorize it, and another command to pretty-print it.
Use case: Run rosie, generate JSON output, filter the JSON using any tool at all, then want to examine the results. These results are JSON objects, 1 object per line, and hard to read. (That's why Rosie colorizes output, to make it easy to see matches.)
Solution: Expose the rosie colorizing feature such that it can take rosie JSON as input. Similarly, expose the rjsonpp pretty-printer (which is not part of rosie today) as a rosie CLI feature.