Change settings at breakpoint

It would be nice to do something similar to [slick](http://kenwheeler.github.io/slick) where you can define settings that only kick in at certain breakpoints.

For example, on a wide screen I would like to show multiple items and allow free scrolling, but on a smaller mobile device I would like to only show one item at a time and snap to each item. I see that the showing one at a time option is doable now by setting the width to 100%, but changing freeScroll is not possible currently (as far as I can tell).

Is there a simple way to handle this?

Thank you.

Start by reviewing Flickity's current responsive settings and the existing freeScroll and item-width behavior described in the issue. Compare the requested wide-screen and mobile configurations, including multiple items versus one item and free scrolling versus snapping. Done means settings can change at defined breakpoints without requiring separate carousel instances.

Written by the indexing model from the issue text.