Support post format-3 fonts in fs.appendGlyph()

[justvanrossum]

Assuming fonttools-made glyph names.

[justvanrossum]

Hm, fonttools actually does smarter glyph name synthesys for encoded glyphs (using AGL and uniXXXX names). Perhaps this change is too simplistic.

I don't think we have access to a (cached) TTFont instance to make a glyph name -> glyph ID mapping efficiently possible.

Alternatively, fs.appendGlyph() could accept glyph ids by means of an isinstance(glyphName, int) check.

[typemytype]

Support indexes as int is perfect

[typemytype]

• adding test
• fixing other tests :)

[justvanrossum]

LGTM :)