Instead of using limited-lifetime particles that need to be
refreshed, use sprite entities, which never need to be replaced
as long as they stay loaded.
There was a short "glitch" when replacing the particles where
they could appear twice, or be absent, for a frame or two. If
we're taking the screenshot at insanely high resolution/AA, which
the automation in this mod enables, we may have fractional FPS,
and the time window when the particles are in an invalid state
may expand to the point where it's impossible to capture a
screenshot with the correct smoke particles.
Making the smoke particles stable this way makes it possible to
reliably capture a screenshot with correct smoke particles at
insanely high quality / low framerate.
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