Switch to Interactive2DPlot

There's currently a bug in the UI that occurs due to the way that I'm injecting JS into the application. Steps to reproduce:

1. Run a reduction.
2. Click the stitching tab.
3. Re-run the reduction.

The stitching handlers will try to re-bind, which will cause the stitching tab's overlay/spinner to briefly appear.

Now that we've got a better way to bind listeners to these charts, I want to completely do away with prepare_charts.js and locking the UI after an update to the stitching parameters.