[sfnt] Support PaintScale in 'COLR' v1 parsing.

* include/freetype/ftcolor.h (FT_PaintFormat): Renumber values, add
`FT_COLR_PAINTFORMAT_SCALE`.
(FT_PaintScale): New structure to represent 'PaintScale*' tables.
(FT_COLR_Paint): Updated.

* src/sfnt/ttcolr.c (FT_PaintFormat_Internal): New enumeration.
(read_paint): Parse 'PaintScale' and friends.
3 files changed