Otherwise it gets too deep.
I think there's an option in eclipse to forbid this by project in
format, one can config depness iirc.

This is a clean generalization from 4 to N.
Pseudo-pyramid because the vertices in the base of the pseudo-pyramid
don't need to be on the same plane. There's no base of the pyramid as such.

Better documented and cleaner thanks to @tobbelobb on github.

…etups

- Change from bool to class and introduce None mode for
custom (experimental) setups (all allowed)

- refactor out IsInsidePyramidSides

- refactor out IsInsidePrismSides

- introduce HangprinterAnchorMode::LastOnTop for prism-like setups
  with all anchors on top

- introduce a T parameter in M666 to configure the anchor mode

This allows to print square pyramids instead of tetrahedrons, at the
cost of an extra motor.

WIP: not everything is adapted after recent changes. See the newest TODOs