Delocate

Bugfix release.

- Adapt parsing of otool output to Catalina, avoiding crash in delocate
(thanks to Github use `matham` for the report)
- Adapt to possibility that `wheel` binary is not on PATH.
- Various improvements to documentation, including explanation of Delocate's
problems in dealing with single module extensions (Brad Solomon)
- PEP8 maintenance by Grzegorz Bokota.

Bugfix and new feature release.

- More extensive search for libraries that code depends on, using macOS path
search algorithm (Forrest Brennen, Ofan Tester).
- Fix for newer XCode messages for "not an object" (Andy Wilson)
- Fixes to Wheel zip file permissions and attributes (Cosimo Lupo and MB).
- Some Windows path compatibility (Isuru Fernando)
- Bugfix for use of undefined variable in `get_install_id` (Anthony
Sottile).

Bugfix release to deal with large number of breaking changes in wheel
0.32.0.

- Refactor to deal with Wheel 0.32.0, with massive refactoring of the API,
and the use of zero permissions RECORD file.
- Refactor to use Pytest (many thanks to Github user Xoviat).
- Beginning of Windows refactor (Xoviat again).

Also deal with xcode 8.3 message from another binary file.

Make compatible with latest Xcode error messages.

Fix broken tests from 0.7.0.