Get tests to pass on Windows in CircleCI

Fixes to get tests passing on Windows platform:
- Add CircleCI config for running tests on Windows.
- Call pytest as python -m pytest on Windows.
- Remove carriage returns from phonologies read from disk.
- Skip large corpora tests on Windows.
- Update all dependencies for windows CI testing. (Windows was refusing to run tests otherwise with "Unauthorized access".)
- Make file separator platform-sensitive in config files.
Fix morphemic analysis in Py>=3.7
- Behaviour related to regexes in Py37 has changed, which breaks assumptions in the morphemic analysis code. This fixes that.
Fixes related to file type recognition across platforms:
- Move guess_type to utils and resolve platform diffs.
- Put guard around mimetypes guess_type.
- Add hack for recognizing .ogg files on Windows.
- Fix audio/x-wav audio/wav discrepancy across platforms.
- Replace python-magic with python-magic-bin on Windows.

dativebase / old-pyramid