[HarfBuzz] features enumeration

[Pierre Marchand]

Hello,

As I didn't want to allocate random amount of memory
when enumerating opentype features, I added few
functions in the public api.
Don't know if it fits with HB coding style tho.

diff attached

-- 
Pierre Marchand
+32 484 184 435
http://www.oep-h.com
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