saugns v0.3.7b. Tweak cli and minor clean-up.

Command-line behavior: Print -p info for each script just prior
to generating audio for it if done, instead of printing for all
before generating for all.

Fix v0.3.6f slip-up in moving changes across branches, which
made the usage notice say "mgensys" instead of "saugns".

Flense generator, simplifying away most "event data"
and using what's allocated at the previous stage.

The code previously in renderer/ is now in player/.
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