TODO

- HB_OT_LAYOUT_GLYPH_CLASS_BASE_GLYPH vs LookupType::... mess
- Rename LookupFlag::MarkAttachmentType to LookupFlag:IgnoreSpecialMarks
- cmap14 support in get_glyph callback
- size_t?
- Figure out compiler selection (add test for link to libstdc++)
- Rename MEMORY_MODE to ACCESS_MODE