[Bug-zile] Towards an efficient buffer implementation for Lua Zile

[Reuben Thomas]

I've now put the Lua in place (separate but currently identical
implementations), and I've fiddled with alien to learn how to get at
the functionality I need; it's just a question of putting the pieces
together.

One nice thing I realised is that I can make the use of alien
optional: if you don't, for example, have libffi on your platform
(which alien requires), then you can just get a somewhat slower Zile.

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