Proper group movement (flocking, formations, ...)

[Indy2222]

Groups of object should reasonably move together:

• [ ] clustering
  • objects are clustered when send to a target so close objects make flocks
• [ ] flocking
  • objects are attracted to their relative position from flock centroid
  • object are influence by average flock velocity
• [x] repulsion
  • objects are repulsed from other nearby object

Benchmark the solution.

[github-actions[bot]]

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