Destructuring improvements/fixes

[brettz9]

A couple issues on the new destructuring support:

• Where a root and grandchildren are present but not children, the fixing order is off.
• As per checkDestructured property to disable destructured checks #532 (review) , we'd like to have clearer messages for reporting destructuring issues. To do this, we need to have a proper function for stringifying a destructured parameter object.
• Report the proper line numbers

I put the issues together since for implementation, I think it will be easiest to refactor getFunctionParameterNames to handle both cases (perhaps avoiding flattening--need to investigate).

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