[COLRv1] Simplify paint_glyph() Pass a non-synthetic font to the client, so they don't have to worry about it. The only issue left, is that now when paint_glyph() paints an outline glyph (not color glyph), it would be double-slanted. I'm leaning towards removing painting of outline glyphs from the paint API and change the paint API to return a boolean.