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Update data via lodash's fp/set

Use lodahs's "fp/set" instead of "cloneDeep" to increase performance
for data updates, especially for larger models.

Previously JSON Forms used lodash's "cloneDeep" to create a copy
of the current data and then update the relevant parts. This has the
benefit of being a guaranteed immutable update, however it's an
expensive process and hinders using shallow compare on data
objects which were not touched. We now use "fp/set" as a
compromise: It will create new objects for all elements directly
containing the updated data, while leaving sibling elements
alone. This increases performance a lot while still triggering
updates for the changed objects.

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