emission_rate: How many particles should be emitted per second
direction: In which direction the particles should move
velocity: At which speed they should move
duration: How long does the emitter emit particles
repeat_delay: How long until it start emitting again
time_to_live: The length of the life of a particle
time_to_live_min: The minimum lifespan of a particle
time_to_live_max: The maximum lifespan of a particle
angle: How much the particles' movement direction can differ from the direction given
colour: The color of a particle an particle has
colour_range_start: Beginning point for the particle's color interpolation
colour_range_end: End point for the particle's color interpolation
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