round coordinates to integers in a few places

Thanks Lion Kimbro for pointing out this issue.

I still have to use floats for start/end angles of arcs. That might be a
sign that I don't have the right serialization yet for them. Or that
that feature needs to go.

I started out with a hazy idea of only using 8-bit ints for coordinates,
but now I'm not sure how committed I am to that constraint. While the
width is always 256 units, it might be nice to create long portrait
drawings at some point, whose height is greater than 256 units.

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