Flake8-comprehensions

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* Remove check for set comprehensions in rule C407 as it would change the
results for certain builtins such as ``sum()``.

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* Add ``filter`` and ``map`` to rule C407.
* Check for dict and set comprehensions in rules C407 and C412.

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* Remove the tuple/unpacking check from C416 to prevent false positives where
the type of the iterable is changed from some iterable to a tuple.

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* Ensure the fix for false positives in ``C416`` rule for asynchronous
comprehensions runs on Python 3.6 too.

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* Fix false positives in ``C416`` rule for list comprehensions returning
tuples.

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* Fix false positives in ``C416`` rule for asynchronous comprehensions.