Chris Loer 40b0c8d076 [core] Use UTF-16 instead of UTF-32 for label features to avoid extra conversions and reduce in-memory size. ...

Continue to use uint32 as glyph ID to maintain Glyph PBF, even though we're only using 16 bits of that uint32.
Use std::codecvt instead of boost::unicode_iterator for UTF8->UTF16 conversions.

2016-11-17 14:33:03 -08:00

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