Add cloneDeep for data

[Scimonster]

I found my app rerendering too often due to the data object changing as well. Plotly was adding uid keys to the traces.

[benjeffery]

Thanks for the PR, I'm a little wary of merging this as cloneDeep can be very expensive. I begrudgingly added it to layout as it tends to be limited in size - however data can be a very large object. Ideally fixing #6 properly should fix this. Putting this on hold for now.