More flexible image data format for updating about tev HOT 1 CLOSED

Heya,

I was a little on the fence with this one as this is a slippery slope. Wanting to support direct transfer of frame buffers could easily evolve into also requesting multiple precisions, image formats, pre-multiplied alpha or not, etc.

Basically, implementing a whole 'nother image format.

And the performance/memory benefit is only really there when the renderer runs on a different machine from tev. If it's the same machine, the conversion to tev's internal non-interleaved format needs to happen somewhere on the system anyway.

But I guess this is simple enough to just hack in for now---plus a fun little exercise in making my ghetto IPC protocol backwards compatible after the fact. :p

from tev.