Buffers are getting passed around too much (figure out a way to abstract this out more)

[kvkenyon]

There are too many buffer types. Buffer, MemBuffer, ConstBuffer etc.

We have buffer.buffer even in some places.

Ideally a thunk has lazy data of any shape with any type of backing buffer/file/etc.). LazyData should abstract the buffers. We should only see buffers late in the engine on kernel exec.

Assign too, ops on the buffers etc.