Fontparts

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- Adds `openFonts` (more than one font). Issue 545. (thanks typesupply!)

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- Adds `glyph.autoContourOrder`. Issue 645. (thanks roberto-arista!)
- Adds `FuzzyNumber` to `base.py`. Needed for the above, copied from defcon. (thanks typemytype!)

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- Fixes issue with setting glyph name when copying. Issue 633. (thanks typemytype!)

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- Fixes issue with `defaultLayer` and copying a `font`. Issue 630. (thanks typemytype!)

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- Add vaidate kwarg to _loadFromGlyph 623. (thanks ctrlcctrlv)

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- Update to use Collections.abc.Hashable by benkiel in 622
- Start testing Python 3.10 by benkiel in 619