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Minetest Advanced Particle Spawner Proof-of-Concept
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This is a pure server-side lua implementation of a proposed API for
advanced particles spanwers for Minetest, which allows some particle
effects to be achieved that are not possible with the existing particle
spawners.

The behavior defined by the API in this mod is currently implemented by
sending a swarm of add_particle packets to the client (individually for
each particle) BUT it could be done much more efficiently in the engine
by sending a single add_particlespawner_advanced packet to the client.

The key difference from this API compared to the standard particle
spawner one is that you can define the particle's parameters as a
linear function of a constant, time, and 12 random variables.  The
12 random numbers are enough for each of the original random variables
to have an independent/uncorrelated random value (i.e. you can implement
a standard particle spawner's behavior using the advanced one) but
interesting things happen when you reuse a single random value between
different parameters.

Included are a bunch of demo nodes, each of which creates a special
particle effect that cannot be achieved with ordinary particlspawners
every 2 seconds.  Use a /giveme command to give yourself demo nodes:
	/giveme advparticles:demo#
...where # is 1, 2, 3, etc.  Place the node to see the effect created
around that node.  Punch to remove.

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