----------------------------
- [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).