Glyphslib

- Fixed issue copying intermediate layer from composite to component (976).
- Export "variable export settings" a `<variable-font>` element in DesignSpace v5 (977).
- [anchor_propagation] Fix adjusting mark component's named ligature anchor (975).

- Fixed bug exporting to UFO composite glyphs referencing colorPalette layers (973, 974).
- When exporting to UFO, ensure a component glyph has the same intermediate layers as the composite glyph using it, otherwise VF masters are incompatible (971).
- Make the ContextualMarkFeatureWriter work with the new ufo2ft v3 variable feature writer API (957, 972).

- Better ``GSPath.segments`` implementation with no infinite loops (967).
- Skip empty feature labels when converting to UFO (970)

* Improvement to handling of corner components (958)
* Update to Hebrew glyph data (960)
* Skip unexported glyphs when parsing tokens (962)
* Skip ignorable anchors when writing out mark features (964)
* Improve the behaviour of GSPath.segments with open paths (965)
* Tweak the .gitignore file (961)

- Fixed infinite loop in Path.segments getter when quadratic curves are present (949, 951).
- Added support for 'Virtual Master' custom parameter when defining Designspace axes min/max;
also we now make sure those parameters are exported in the UFOs and can be round-tripped back
to .glyphs (955, 859).

- Do not set unicode codepoints for COLRv1 layer glyphs to prevent ufo2ft raising error about duplicate unicode mappings (947, 946).