Particle Decay

[stuarthoye]

When a particle decays:

• It slows before breaking apart
• We should probably disable its collider
• We assign the compound particle's transform to the two parent particles
• We destroy the compound particle
• We re-enable the two parent particles
• We set a timer that allows the two parents to move apart before re-enabling their colliders

[stuarthoye]

So far, we're at a place where the particle decays and disappears. It's parents are deactivated and only need to be reactivated, and have their transforms updated.