This diff fixes two longstanding layout issues affecting the Gaant viz and also the left list of steps on the partition matrix:
- The ordering of steps in "flat" mode is technically correct but didn't group chains of solids together. Re-ordering two steps of the algorithm makes this possible.
- If steps were skipped, the "waterfall" (not timed) mode would present skipped steps on top of the executed steps rather than at the end of the chart.
I also incldued the chartjs types as a dev dependency because they are needed to fully introspect the options passed to our react-chartjs-2 components