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We can avoid some unnecessary work at the max depth by checking it in
shade_ray() instead.
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powf() is slow but precise, this isn't the fastest method but it's
at least portable and a bit faster.
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Just embed a _prepared struct in the object where precomputed stuff can be
cached. Gets called once before rendering, which ends up calling the
object-specific ray_object_$type_prepare() methods per object.
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Now that rototiller is generally threaded when a prepare_frame() method is
supplied, and modules/ray has been updated accordingly, discard the now
redundant ray-specific threading code and related stuff.
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Was a constant at 20, this allows it to be specified per-object.
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trace_ray() bumps the depth, the reflection ray trace_ray() call just needs to
propagate the depth variable not advance it as well. This was probably
vestigial from early development and never got taken out.
This does mean more reflections now, and correspondingly slower rendering, but
it at least makes MAX_RECURSION_DEPTH accurate. The define can be changed if
the performance is too bad.
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Restoring some organizational sanity since adopting autotools.
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