When available, use inspect.getfullargspec instead of inspect.getargspec. #3116
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The former is only available in Python3, in which getargspec was
deprecated.
Motivation for features / changes
This allows to get rid of a deprecation warning when using Python3.
Technical description of changes
Uses a Python3 drop-in replacement, when available.
Both return a namedtuple with an equivalent "args" attribute, so the
functionality is unchanged.
Screenshots of UI changes
N/A
Detailed steps to verify changes work correctly (as executed by you)
Ran event_file_loader_test, in Python2 and Python3.
Alternate designs / implementations considered