[sfnt] Support PaintScale in 'COLR' v1 parsing
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include/freetype/ftcolor.h (FT_PaintFormat): Renumber values, insert FT_COLR_PAINTFORMAT_SCALE. Update documentation to explain how these values are used. (FT_PaintScale): Add representation for PaintScale* tables.
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src/sfnt/ttcolr.c (read_paint): Parse PaintScale and friends.