Coldtype-fontgoggles

- Fix crash with faulty COLRv1 font ([Issue 213](https://github.com/justvanrossum/fontgoggles/issues/213), [PR 214](https://github.com/justvanrossum/fontgoggles/pull/214), [blackrenderer PR 57](https://github.com/BlackFoundryCom/black-renderer/pull/57))

- Fix cosmetic problem on macOS 11 ([Issue 202](https://github.com/justvanrossum/fontgoggles/issues/202), [PR 209](https://github.com/justvanrossum/fontgoggles/pull/209))
- Update OpenType feature/language/script tag descriptions ([PR 208](https://github.com/justvanrossum/fontgoggles/pull/208))
- Fix build problem on macOS 11. Thanks Khaled Hosny! ([Issue 206](https://github.com/justvanrossum/fontgoggles/issues/206), [PR 207](https://github.com/justvanrossum/fontgoggles/pull/207))
- COLRv1 spec update via blackrenderer 0.5.0a2 ([Issue197](https://github.com/justvanrossum/fontgoggles/issues/197), [PR 204](https://github.com/justvanrossum/fontgoggles/pull/204))

- Fixed bug where UFO's would not display ([Issue 185](https://github.com/justvanrossum/fontgoggles/issues/185), [PR 186](https://github.com/justvanrossum/fontgoggles/pull/186))

- Updated blackrenderer to 0.3.1, adding support for the COLRv1/PaintComposite construct

- Don't show hidden axes by default, add button to show them ([PR 173](https://github.com/justvanrossum/fontgoggles/pull/173))
- Added experimental support for variable components in two forms: fonts with a [VarC table](https://github.com/BlackFoundryCom/variable-components-spec), and fonts with an ["extended" COLRv1 table](https://github.com/fonttools/fonttools/pull/2302) ([PR 174](https://github.com/justvanrossum/fontgoggles/pull/174), [commit on master](https://github.com/justvanrossum/fontgoggles/commit/c347b8bc3736abb06142f35ed556f67d43af0ea5))
- Show versions of all major dependencies in the About text

- Added support for [COLRv1 fonts](https://github.com/googlefonts/colr-gradients-spec/) ([Issue 162](https://github.com/justvanrossum/fontgoggles/issues/162), [PR 171](https://github.com/justvanrossum/fontgoggles/pull/171))