modules/shapes: add scale setting

scale=1-.5 with a few other fractions in between

Mostly added for the sake of rtv/compose where modules currently
always go full-frame, which can be really annoying sometimes for
shapes without any variety in the scale.

When checkers starts filling cells using modules like shapes,
it'll be interesting to see how this fares there since it'll
probably be randomizing the settings too.  At least floored at
50% should still produce something legible in /most/ of the
checkers cell sizes.  Definitely won't look like anything in the
smaller end of the checkers sizes though... hrm.

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