• [tfmLib] Added new library for parsing TeX Font Metric (TFM) files (#2354).
• [TupleVariation] Make shared tuples order deterministic on python < 3.7 where Counter (subclass of dict) doesn't remember insertion order (#2351, #2353).
• [otData] Renamed COLRv1 structs to remove 'v1' suffix and match the updated draft spec: 'LayerV1List' -> 'LayerList', 'BaseGlyphV1List' -> 'BaseGlyphList', 'BaseGlyphV1Record' -> 'BaseGlyphPaintRecord' (#2346).
  Added 8 new PaintScale* tables: with/without centers, uniform vs non-uniform.
  Added *AroundCenter variants to PaintRotate and PaintSkew: the default versions no longer have centerX/Y, but default to origin.
  PaintRotate, PaintSkew and PaintComposite formats were re-numbered.
  NOTE: these are breaking changes; clients using the experimental COLRv1 API will have to be updated (#2348).
• [pointPens] Allow GuessSmoothPointPen to accept a tolerance. Fixed call to math.atan2 with x/y parameters inverted. Sync the code with fontPens (#2344).
• [post] Fixed parsing post table format 2.0 when it contains extra garbage at the end of the stringData array (#2314).
• [subset] drop empty features unless 'size' with FeatureParams table (#2324).
• [otlLib] Added otlLib.optimize module; added GPOS compaction algorithm. The compaction can be run on existing fonts with fonttools otlLib.optimize or using the snippet compact_gpos.py. There's experimental support for compacting fonts at compilation time using an environment variable, but that might be removed later (#2326).