"Bake" Particles to real objects.

The ability to bake particles into real objects with their own animations.

• Blender would have to realise and hide all particles in the system, and key-frame their visibility on when the particle system would birth them. (Unless show unborn is checked)
• Realised objects would have their visibility key-framed to hidden when they would have died (Unless Show Died is on)
• Option to create new objects as separate meshes or instances of the particle object mesh (To save memory!)
• Once baked, any animations on the original object (colour, scale etc) would be copied to the new objects, offset by their birth frame.

Benefit: Create a particle system, then manually tweak motion paths, to avoid collisions etc. Don't need to trust particle system to get it just right!