Interaction bugs between animation and sample / feature metadata coloring

[fedarko]

Steps to reproduce:

1. Open the animation tab and start some sort of animation
2. Go to the sample or feature metadata coloring tab (without stopping the animation), and (if not already open) press the checkbox to open up the coloring options.
3. Change an option (if needed) and press "Update" in the sample or feature metadata coloring tab
4. The plot will now be updated to use the requested metadata coloring option
5. ... However, a few seconds later, the animation will continue (since we never stopped it), undoing the metadata coloring methods while still leaving them "checked."

You kind of have to try to break Empress to get this to happen, but it's still confusing -- so we should address this if we can IMO.

[fedarko]

This will also be a problem with synchronized animations (#319). We can probably get around this by adding a disableColoringUI() function or something that disables all of the "breaking" Empress options while animations are happening, and an enableColoringUI() function that does the reverse (and is called when an animation is finished / restarted / etc.).

[fedarko]

This was closed by #505. Thanks @kwcantrell! 🎉 🎉 🎉