• [COLRv1] Various changes to sync with the latest CORLv1 draft spec. In particular:
  define COLR.VarIndexMap, remove/inline ColorIndex struct, add VarIndexBase to PaintVar* tables (#2372);
  add reduced-precicion specialized transform Paints;
  define Angle as fraction of half circle encoded as F2Dot14;
  use FWORD (int16) for all Paint center coordinates;
  change PaintTransform to have an offset to Affine2x3 (#2359).
• [ttLib] when importing XML, only set sfntVersion if the font has no reader and is empty (#2376)