loon: keyword args (the skin/skin-gap/skin-gap-res ladder is the tell); render: --view side draws the front elevation

[ecto]

Two small ones:

1. loon has no keyword or optional args, so one operator with two options became three names: skin, skin-gap, skin-gap-res (precedent: the import-mesh/import-mesh-scaled split). Optional trailing keywords ([skin 15.0 :gap 3.0 #[...]]) would stop the combinatorial naming.
2. vcad-render --view side renders the FRONT elevation; the true profile needs --azimuth 90 --elevation 0. Found while checking rose-pro's leg profile.

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