3.30.0

• [feaLib] Skip building noop class PairPos subtables when Coverage is NULL (#1318).
• [ttx] Expose the previously reserved bit flag OVERLAP_SIMPLE of glyf table's contour points in the TTX dump. This is used in some implementations to specify a non-zero fill with overlapping contours (#1316).
• [ttLib] Added support for decompiling/compiling TS1C tables containing VTT sources for cvar variation table (#1310).
• [varLib] Use fontTools.designspaceLib to read DesignSpaceDocument. The fontTools.varLib.designspace module is now deprecated and will be removed in future versions. The presence of an explicit axes element is now required in order to build a variable font (#1224, #1313).
• [varLib] Implemented building GSUB FeatureVariations table from the rules element of DesignSpace document (#1240, #713, #1314).
• [subset] Added --no-layout-closure option to not expand the subset with the glyphs produced by OpenType layout features. Instead, OpenType features will be subset to only rules that are relevant to the otherwise-specified glyph set (#43, #1121).