6949 - snapshot of next raytracing milestone

Not yet right, but worth a snapshot just because it gives a cool result.
Here, try it out:
  $ ./translate_mu_debug apps/raytracing/3.mu
  $ ./a.elf > x.ppm
Now view x.ppm as an image.

In general, this was quite tedious to write. And a still-open question
is how to emit the progress bar to stderr. My options are to either duplicate
all my print-* functions (already proliferating) or add global variables
to Mu.

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