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To be precise, a splay tree, chosen for its relatively simple
implementation and OK performance given biased access patterns.

This fixes a (probably false) positive for static analysis.

Signed-off-by: Aisha Tammy <floss@bsd.ac>

To (slightly) improve backwards compatibility, instead of modifying
the dmabuf video setup message, this change creates a new message
type that is used when the new features are.

Also make padding on the wire-compatible dmabuf_slice_info struct
explicit and statically checked.

The strtol and strtoul functions allow leading whitespace, and
leading + signs, neither of which make sense in the places they
are used. This change also makes the error handling simpler.

And fold in the abort message when the sigint handler is called
a second time.

This will later be used to run `waypipe bench` as part
of the test suite; being able to reduce the size of the buffers
being transferred lets one significantly reduce the runtime.

This change use the fact that calloc and ftruncate provide
zero-initialized memory effectively for free, so it is easy to
create consistent initial states for files + mirror buffers. It also
makes Waypipe more efficient with applications that allocate huge shm
pools but only use a tiny fraction of them.

This change may slightly slow down buffer creation in the usual case,
because the first update will use the 'diff' instead of the 'fill'
command.