Simplification and unification of source code: evolve conditionally and collect data?

[Datseris]

I have an idea that I believe will be able to unify all functionality currently present in e.g. evolve, visited_obstacles!, escape_time and similar (timeseries is excluded probably due to its interpolating nature). We could have a single function evolve or whatever its called that evolves until a condition is met: this condition could be total amount of time, total amount of collisions, reaching a specific obstacle, whatever. You name it! it can be specified via a single function.

Then, one more other argument would specify what kind of data should be collected. I wonder how easy this really is to do, but my argument would be that you would specify what kind of data to "collect". The huge difficulty here is the "kind of data" vastly differs: from integers (e.g. which obstacles you visited), to floats (how long you evolved for), to tuples of svectors (position and velocity at collision).

But maybe we can provide some "self-made" functions for data collection.

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