Copyright header fix, some minor stuff

Subject Bézier curve fineness to the grid. By default, the coarse grid uses 8 segments, medium 16 and fine 32. Moved rasterization from demoting to inlining, it feels more sensible for it to be there.

Bézier curves now render in 3D

Bézier curves are now parsed correctly

Bézier curves may now be serialized down using the "Demote" function. I need to rename that now.

Added some pretty pics that I left out of the previous commit.

Begin work on Bézier curve support. They can be drawn but don't render in 3D and they load as comments.

And now it should work again too

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