> Next step (after some more testing) will be to implement Proximity() for other
> object types.

Implemented Proximity() now for:

Mesh
Sphere
Box
Triangle
Plane
Disc
Cone (includes cylinder)

For non-solid objects like Triangle, Disc, Cone (if open), the proximity will
always be positive, since there is no well-defined "inside", so for testing
isosurfaces, I set threshold to 0.001 instead of 0.0, so it actually renders a
little thickness around the object.

I also implemented fn_nearest_point, that returns the nearest point calculated
by the Proximity() code.

So for proximity, you define the function like this:

#declare fn_X = function { proximity { shape } }

For nearest_point, you define the function like this:

#declare fn_N = function { nearest_point { shape } }

proximity functions return a double
nearest_point functions return a 3d vector position <x, y, z>

Attached a test render for an open cone, with some test points arrayed around
it.

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