Animated values:
- particle speed
- particle size
- emitter direction
- emitter radius
- emision rate
- gravity
- trembling particles
- approximate sdf/text
- camera shake
- color flash
- camera position
- camera lookat
- animated 3d smoothnoise (tweakable speed):
	- offset amplitude
	- color amplitude
	- size amplitude
	- speed bonus

Events:
- spawn 1 emitter
- clear all emitters
- explosion (replace all emitters with many random points)
- shock wave (add world-space impulse to nearby particles)
- split all emitters into 2