* Use variable annotations
* Replace default values by ellipses
* Remove exceptions from function bodies
* Remove superfluous comments
* Remove superfluous newlines
* Use Optional instead of Union[..., None]
* Replace Union[int, float] by just float
* Make time.pyi (Python 2) more closely resemble the Python 3 stub
* Replace _TIME_TUPLE by TimeTuple
* Reorder imports
* time.pyi: Mark two arguments as optional, mark Unix-only function
* time.pyi (Python 2): Use TimeTuple in NamedTuple and reformat
This makes time.pyi more closely match the Python3 version.
* Merge Python 2 and 3 versions of time.pyi
* Only import SimpleNamespace on Python >= 3.3
* Remove default values from module properties
* Remove Optional from strftime() and asctime()
* accept2dyear was removed in Python 3.3
* Rename TimeTuple to _TimeTuple
