v6.0.0

First stable release in the 6.x series

The major change in this release cycle is the support for Glyphs 3 file format and using openstep-plist for parsing Glyphs file instead of the home-grown plist parser.

This release requires Python >= 3.7.

Other changes since last stable release include:

• Update GlyphData.xml to commit 0fe81a0 (#665)
• Implement "Link Metrics ..." custom parameters (#641)
• Close open corners with a ufo2ft filter (#663)
• Support FontLab 7 Glyphs export format (#719)
• Various housekeeping fixes (#704, #705, #720)
• Improve GSNode.read* performance (#732)
• Construct glyph data from unicodes as a fallback (#736)
• [builder] Check that vert{Width,Origin} are not None, can be 0 (#659)
• [builder] Support hints with target="up" and "down" (#613)
• [builder] Store layer names for roundtripping (#664)
• [builder] Guard against rogue comments in glyph classes (#660)
• [builder] Optionally, only export UFO layers needed for font compilation (#674, #722)
• [builder] Respect "Propagate Anchors" custom parameter (#683)
• [builder] Only write locations along defined axes (#739)
• [builder] Export COLRv0 layers (#716)
• [builder] Export COLRv1 layers from Glyphs 3 Color layers (#751)
• [builder] Export stylistic set feature names from Glyphs 2 feature notes and Glyphs 3 feature labels (#615)
• [builder] Add glyph_data argument to glyphs2ufo and to_ufos() (#668)