Many 'o' fixes#71

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ntninja wants to merge 8 commits into

python-trio:masterfrom

Commits on Dec 22, 2020

Add support for forward-reference typings (PEP-484#forward-references)
ntninja
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Do not fail when receiving `pathlib.Path` objects as filepaths anywhere
ntninja
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TEMP Try fixing Python 2 coverage as suggested
ntninja
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