Implement different embryogenesis overlap resolving strategies

[benelot]

Different strategies to take on collision:
-Remove last added bodypart and do not create any new generators
-Shrink last added bodypart until there is no collision anymore
-Rotate last added bodypart out of collision (may be hard)
-Connect last added bodypart with the colliding bodypart using a fixed joint or other joint (could even be up to evolution what to use on collide. Thereby, they do not collide anymore and the system would be able to create rings.