More nParticle Butterfly Tests

Just quick adjustments the the force fields (turning down turbulence and keying various field's magnitudes) and changes to the custom aim expression/script.

Still not convinced on the general behaviour of the butterflies, I think I will write my own flocking system to deal with them. At the current state, they are most useful for long shots and when the butterflies may need to collide with objects due to the use of nParticles.

I think creating a custom flocking system will be to mainly provide a more realistic flight behaviour, with less sharp changes of direction which is an artifact of the current solution and also to allow for butterflies to follow and go to certain positions defined by the user. At the current moment I am unsure of how to do such things with nParticles and expressions.

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