resolveObject is mutating the properties object

[dbanksdesign]

This is the offending line:
https://github.com/amzn/style-dictionary/blob/master/lib/utils/resolveObject.js#L29

_.clone() is only a shallow copy, so when resolveObject is called it mutates the original properties object. This can have dire consequences because that means the properties object could change from platform to platform.

Fix: change to _.cloneDeep