get_contour_point now takes glyph id before point_index.

get_kerning now takes a vector to fill-in.

Don't use _cached()

Makes way for adding arbitrary user_data support.

So we can liberally use the simple features of C++ that parts of the
codebase is already using.

This is the common convention for language binding tools.

Graphite module not updated.
Bump version to 0.3.

Helps with avoiding many "extern C" declarations in source files.

hb_font_set_scale() now sets the value to be used to represent a unit
pixel.  For example, if rendering a 10px font with a 26.6 representation,
you would set scale to (10 << 6).  For 10px in 16.16 you would set it to
(10 << 16).  This space should be the same space that the get_glyph_metrics
and get_kerning callbacks work in.

In anticipation for buffer revamp coming.

The former is more robust.  See discussion on freetype-devel.