Image Trace: Shapes finds rounded rectangles and shapes in aliased, blurred and scanned art

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- A sharp corner may fall up to 0.75 px short within 3 px of where it should be:
  anti-aliasing and blur take that much off a corner (not on a thin bar, which
  is all corners).
- A rounded rectangle gets the radius that fits its outline best, searched
  around the one its area says, instead of that one alone.
- A rectangle's direction is tried along its longest straight side, the longer
  axis of its area and the pixel grid: a blurred one may have no straight side.
- A regular polygon's sides, corners and size are read from the outline's shape
  (how its distance from the middle goes round, and its area), not from how many
  anchors the fitter gave it.
- An outline without anti-aliasing is known to half a pixel: it gets half as
  much room again.

Plain shapes found with Shapes on, all sizes and variants: Default 57% -> 98%,
6 Colors 62% -> 100%. The harness counts false shapes: none on any input but one
thin line (a rectangle 2 px wide) whose trace is 0.70 px off with or without
Shapes.

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