Region modifiers repeat/transform/jitter/round/x-y range are parsed but ignored #15

{ type: "palette", name: "p", colors: { _: "transparent", body: "#e6dccd", outline: "#000000" } }
{ type: "sprite", name: "blob", size: [8, 8], palette: "p", regions: {
    body: { rect: [2, 2, 4, 4], z: 0 },
    outline: { "auto-outline": "body", thickness: 1, z: 1 },
} }

pxl mask --count reports 16 body pixels and 0 outline pixels.
RegionDef parses auto-outline, repeat/spacing/offset-alternate,
transform, jitter, round and the x/y range limits, but
structured.rs::rasterize_region never reads any of them, so they are dropped
without a warning. Workaround: the outline is drawn explicitly as a closed
polyline. The teeth are listed one by one instead of using repeat.

Note: auto-outline itself is implemented by the fork integration in #11; the other modifiers remain no-ops.

Found while drawing examples/skull (#13). The repro is checked against main.

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