Accept any path-like object for Image.{open,save} and truetype, not just pathlib.Path

[ntninja]

Also tries to fix some bugs where PIL will crash in case of binary paths, by using os.fsdecode.

Changes proposed in this pull request:

• Accept any path-like object (as introduced with Python 3.6) where it would previously only accept str, bytes and pathlib.Path
• Fix some crashes when using binary paths found during testing/review
• Consistently use the word “filepath” when refering to a filesystem location, rather than the previous mix of the words “file” and “filename”

[radarhere]

Fix some crashes when using binary paths found during testing/review

Are you saying that you've found bugs, separate to the path-like object changes? Could you provide some more detail about this?

[ntninja]

@radarhere: Any idea why that Windows test is failing?

[radarhere]

It's an intermittent failure on master. Nothing to do with your changes.
I've rerun the job, and it passes now.

[hugovk]

Docs suggestion: use "file path" or "path" instead of "filepath" which isn't used much:

• https://pillow.readthedocs.io/en/stable/search.html?q=filepath&check_keywords=yes&area=default
• https://docs.python.org/3/search.html?q=filepath&check_keywords=yes&area=default

[radarhere]

I've made a suggestion for this over at https://github.com/ntninja/Pillow/pull/2

[ntninja]

I think we've resolved this now. Can we merge this then?