Support Unicode cmap platform records#590
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Pixie currently parses cmap subtables only when the encoding record uses the Windows platform ID. Some valid fonts, including Academy Engraved LET and Apple Chancery on macOS, expose their useful cmap through the Unicode platform instead, causing Pixie to report no renderable glyphs.
Accept both Unicode (platform 0) and Windows (platform 3) cmap encoding records. The regression test converts the existing Ubuntu fixture to Unicode-only cmap records and verifies that its glyph map remains available.
Tested with: