Coldtype-fontgoggles

- Updated to Unicode 13.0.0 (both the internal database and the Unicode Picker).

- Fixed an update glitch where the language would not be properly reset after the
user changed the script.

- Updated uharfbuzz to latest version, which fixes a bug retrieving feature tags.
[Issue 63](https://github.com/justvanrossum/fontgoggles/issues/63)

- Rewrote Bi-directional text support ([issue 35](https://github.com/justvanrossum/fontgoggles/issues/35), [PR 60](https://github.com/justvanrossum/fontgoggles/issues/60)). This also implements script segmentation.
- As an indirect consequence of the previous item, the "BiDi" checkbox above
the character list has been removed.
- Fixed regression: dragging fonts between FontGoggles windows works again.

- Added "Reload font" and "Clear error" contextual menus to font item.
- If an error occurs while preparing a VF from a .designspace file, check
whether it was caused within GSUB or GPOS, and try again without that table.
This allows us to at least see a partially working font.

- [designspace] fixed layer composite regression introduced in 1.1.2 with the
fix for [issue 53](https://github.com/justvanrossum/fontgoggles/issues/53).
- Fixed automatic reloading snag. [Issue 48](https://github.com/justvanrossum/fontgoggles/issues/48)