some stuff for dealing with circular buffers, implemented as heap words

by putting this directly on the heap, we allow it to work in the easy, obvious ways, at the cost of extreme verbosity.

the core abstractions here are "buffer", "input buffer", and "buffer metadata". the metadata struct is distinct from the backing store, though there is a convenience word to allocate them together. for communication purposes, the buffer "is" the metadata struct, and the "backing store" is where things are actually read from. all input buffers are buffers but someday not all buffers will be input buffers; note carefully how the various word names make this distinction.

Force-Push: yes
Change-Id: Ib85a74af046b42c8959c6edf93b83e2ad7f21be4

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