[HarfBuzz] more complete feature/mask control

[Jonathan Kew]

Hi Behdad,

For Gecko, we really need support for turning off some of the default features, in addition to specifying extra ones. So I've tried to fill out the implementation of feature control and mask settings a bit more fully; see attached patch.

The code here takes a fairly simple-minded approach, on the assumption that the list of feature settings will normally be short and so it's not terribly expensive to iterate over it.

Hope you can take this or some equivalent behavior soon,

Jonathan

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