Use TypedArrays for GlkAPI

[erkyrath]

Quixe now uses Uint8Array for memory. We could switch glkapi.js over to Uint32Array for character arrays, and have gi_dispa.js send those.

(I don't think glkote.js uses character arrays anywhere; it's all strings.)

Note https://github.com/erkyrath/glkote/issues/27 .