(enum GlyphInfoMask): Delete EncodedMask and

(enum GlyphInfoMask): Delete EncodedMask and
PositionedMask.
(GAPPEND): Delete this macro.
(GET_ENCODED, SET_ENCODED, GET_MEASURED, SET_MEASURED): Adjusted
for the change of MFLTGlyph.  Caller changed.
(run_otf): Simply calls font->get_glyph_id.
(run_command): Reset g->encoded and g->measured for direct code.
(positioning): Delete this function.
(run_stages): Simply calls font->get_glyph_id and font->get_metric.