rhylthyme - Read and Plot 'Rhylthyme' Schedules with 'ggplot2'

Reads 'Rhylthyme' programs (JSON descriptions of parallel tracks of timed steps: recipes, lab protocols, run-of-shows) and plots them as Gantt charts with 'ggplot2'. Step times come from the same timing engine that <https://www.rhylthyme.com> uses, embedded through 'V8', so a plot agrees with the website to the second.