Repetitions / iterations

[CGMossa]

There are currently two ways to make repetitions/iterations possible with bevy.

1. Execute next iteration by resetting all the global components after the final stage has elapsed.
2. Insert a "tag" that dictates if something operates within a repetition or whatever.

(1) has been explored extensively, and the structure of states that facilitates this should be incorporated in this project as well. (2) is fairly hairy, but could possibly show an advantage of using an ECS, and actually yield better performance. It is necessary however to not over feed the framework with too many entities, so the number of "active" iterations has to be kept at a minimum, and should be executed according to some time that respects the repetitions scenario-time as well.