Implement partial IO

[reczkok]

closes #800

• Investigate if having one ArrayBuffer for all data is practical and faster
• Figure a way to cache calls to avoid creating instructions for the same accessed data (to speed up subsequent calls)
• Support unstructs and disarrays

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[reczkok]

I'm currently testing two approaches to partial IO.
The one on this draft:

And one with one big array buffer. Instead of instructions containing the buffer itself they contain views for it:

[reczkok]

I was also wondering if combining instructions in the current draft is worth it. Here is a version without it:

It doubles the speed of contagious writes with almost no overhead in this particular benchmark.

[reczkok]

Closed in favor of #808