dotCooCoo 96d5cd78a9 Revolve: overlapping faces draw in the order of their depths where they overlap ...

Revolve sorted its faces by the depth of each face's middle only, so a
tilted profile with long edges, or a profile of several contours, could
draw a nearer face under a farther one where the two overlap.

- A revolved face carries its view-space plane (none when its corners lie
  off one plane or reach the eye), and Revolve (Classic)'s facets keep it.
- Revolve and Revolve (Classic) put each surface's faces through the local
  depth order Extrude & Bevel uses for its fill and strokes: when two
  overlapping faces are drawn the wrong way round, every pair of
  overlapping faces goes in the order of their depths at the middle of the
  overlap, within the same 4,000,000-comparison limit. A surface already
  in the right order keeps it.
- A group's members, sorted together by depth, go through the same order
  across members.

Docs: docs/revolve.md, docs/effects-parity.md, docs/target-app-parity.md.

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src

Revolve: overlapping faces draw in the order of their depths where they overlap

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tests

Tests: envelope ink tests set type in a test face and check its outlines

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Cargo.toml

Effects: a later painted effect runs on every fill and stroke a piece returns

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